LISTING OF ALL KNOWN SLIDE RULES WITH HYPERBOLIC SCALES by William K. Robinson December 18, 2006
Maker, Name and Other Information
  (See the footnotes below this list for sources of information; and for explanations of symbols used, and for values of the different gauge and cursor marks).    
1 ALVIN (Japan San-Ai Group) ALVIN ELITE VECTOR No. 1157   25 cm.; Plastic face on laminated wood ; Cursor is not framed. Has adjustable metal end brackets. WKR  
Front scales: || Sr, Sq & Sq , P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Note:Sr is radians; Sq degrees Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x  
Gauge Marks on scales: p is on A, B, C, D, CF and DF; p / 4 and M is on A and B; C and C1 are on C and D. Cursor Front: has no marks.  
  Cursor Back: has marks; KW at top middle ; HP(*) is at right on vertical line over A & B scales; p /4 is at a vertical line on left over the A & B scales, and 4/p on the right over the C & D scales.      
2 ARISTO (Germany) Made in Hamburg ARISTO HyperboLog No. 971 1953 - 1960 25 cm.; Plastic; Cursor is not framed. This early version has adjustable metal end brackets WKR  
Front scales: || LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| Back scales: || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, DI, and CIF. The marks " and ' are on scale ST. Cursor Front: has no marks.  
  Cursor Back: has marks; KW at top middle ; HP(*) at right on vertical line over A & B scales; There is a p/4 vertical line on left over the A & B scales.            
3 ARISTO (Germany) Made in Germany ARISTO HyperboLog No. 0971 1961 - 1972 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. WKR  
Front scales: || LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| Back scales: || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, DI, and CIF. The marks " and ' are on the back C scale; e is on LL2 and LL3. Cursor Front: has a mark on right over CF/DF scales (for multiplication of the value on C/D by 36).  
Cursor Back: has marks; kW at top middle ; HP(*) at right on vertical line over A & B scales; There is a p/4 vertical line on left over the A & B scales, and √4/p on right over C and D scales.  
4 In another version of the same No. 0971 rule the Cursor Back has marks; kW at top middle and PS2 at right on vertical line over A & B scales; p/4 is left over the A and B scales; and √4/p is right over the C and D scales.    
5a ARISTO (Germany) ARISTO HyperLog No. 0972 1969 - 1977 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. WKR  
Front scales: || Lloo, LLo1, LLo2, LLo3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1, LLo || Back scales: || H2, Sh2, Th, K, A || B, T&T, ST, S&S, P, C || D, DI, Ch, Sh1, H1 ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF,CI, CIF, and DI. The marks Q and Qare on back scale C; e is on LL2 and LL3.  
Cursor Front: has marks; there's a vertical mark on right over CF/DF scales (for multiplication of the value on C/D by 36); p/4 is left over the A and B scales; and √4/p is right over the C and D scales.  
  Cursor Back: has marks; kW at top middle ; PS2 at right on vertical line over A & B scales; There is a p/4 vertical line on left over the A & B scales, and √4/p on right over the C and D scales.      
5b ARQUIMEDES (Brazil) Archimedes Vectolog 21-D   25 cm. J.R.G.  
Front scales: || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Back scales: || L, K, A || B, T, ST, S, C || D, Th, Sh2, Sh1 ||  
  Have no other details on this slide rule. It was reported to the ISRG to exist by Joo Roberto Gabbardo 06/09/2006. By email he furnished me the information shown here. We do not have pictures of the rule, and so scale arrangement is estimated.  
6 BEACON (Korea) BEACON KOREA No. 315   25 cm.; Plastic; Cursor is not framed. Has adjustable metal end brackets WKR  
Front scales: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Back scales: ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, q || Note: X is radians; q degrees  
  Gauge Marks on scales: p is on CF and DF; c is on the back C scale.             Cursor Front and Back: has no marks.    
SEE THE NOTE AT END OF THIS LISTING REGARDING THE SLIDE RULES DESIGNED BY F. BLANC AND J. ST. VINCENT PLETTS       R. S.  
7a BLUNDELL (Great Britain) Multilog Vector Duplex No. JV 56 1957-1965 Source: Hopp page 144. PMH  
  Do not have a picture or manual for this slide rule. Hopp shows same scales as below No. 506 (Academy Duplex). So these two slide rules may be almost the same. To check this need gauge marks and cursor lines information.    
7b BLUNDELL (Great Britain) Log-Log Electro No. 506 ( Academy Duplex) 1965-1970 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. WKR  
Front scales: || LL01, Ll02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Back scales: || Sinh1, Sinh2, Tanh, A || B, T&T, ST, S&S || D, DI, K, L ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, DI, and CIF; The marks 9' and 9" are on front scales C and D. Cursor Front: has no marks.  
  Cursor Back: There is a HP(*) vertical line mark at right over A and B scales; There a p /4 vertical line on left over the A and B scales, and √4/p on the right over the C and D scales.        
8 BLUNDELL (Great Britain) Log-Log Electro No. A506 ( Super Duplex) 1970-1980 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. PMH and  
Front scales: || LL01, Ll02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| Back scales: || Sinh1, Sinh2, Tanh, A || B, T&T, ST, S&S || D, DI, K, L || clara.co.  
Have a picture for this slide rule from Ron Manley's Web Site of "sliderules.clara.co.uk". Has same scales as above No. 506 (Academy Duplex) but some are with different type fonts and colors.  
  Need gauge marks and cursor lines information as pictures do not show this detail.                      
SEE THE NOTE AT END OF THIS LISTING REGARDING CHINESE SLIDE RULES.                  
9a CHINA BEIJING 6681 Haiou Pai (Seagull) See Haiou Pai on this list 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. WKR  
Front scales: || Ln01, Ln02, Ln03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1 || Back scales: || L, Sh1, Sh2, A || B, T, ST, S, C || D, P, Th, Ch ||  
  Need gauge marks and cursor lines information as pictures do not show this detail.                      
9b CHINA BEIJING LIXUE       No number       Same as listed under Sida (China) 1083       Has same scales as K&E 4083-3 (1939-1946)     R. H.  
10 CHINA SHANGHAI       Cultural Revolution Slide Rule 1002   This appears to be a renamed Flying Fish 1002       eBay  
11 CHINA SHANGHAI 1015-1   Maybe same as listing under Flying Fish 1015-1 eBay  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
12 CHINA SHANGHAI 1018     Maybe same as listing under Flying Fish 1018 eBay  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
13 CHINA SHANGHAI 5891 (Has same scales as K&E 4083-3 (1955 ) Maybe same as listing under Shanghai (China) 5891 Has same scales as K&E 4083-3 (1955) R. H.  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
14 COMPASS (JAPAN San-Ai Group) No. 1325       25 cm.; Plastic face on laminated wood ; Cursor is not framed; adjustable metal end brackets. WKR  
Front scales: || Sr, Sq, P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: Sr is radians; Sq degrees Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x  
  Gauge Marks on scales: p is on A, B, C, D, CF and DF; p/4 and M is on A and B; C and C1 are on C and D.     Cursor Front and Back: has no marks.    
SEE THE NOTE AT END OF THIS LISTING REGARDING THE DIETZGEN SLIDE RULES.                
15 DIETZGEN (USA) Vector Type Log Log No. 1735 Maniphase Multiplex (Variation 1) 1941 -52 10 in.; Plastic face on wood ; Cursor is not framed. Adjustable metal end brackets. WKR  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
16 DIETZGEN (USA) Vector Type Log Log No. 1735 Maniphase Multiplex (Variation 2) 1950 10 in.; Plastic face on wood; Cursor has metal frame. Adjustable metal end brackets. WKR  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
17 DIETZGEN (USA) Vector Type Log Log No. 1725 Maniphase Multiplex   25 cm; Plastic face on wood ;Cursor has metal frame. Adjustable metal end brackets. WKR  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
18 DIETZGEN (USA) Vector Type Log Log No. N1725   1955-59 Source: Hopp page 161. PMH  
  Do not have a picture or manual for this slide rule. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.          
19 DIETZGEN (USA) Vector Type Log Log No. N1725, Microglide   1959-70 25 cm; Plastic face on wood ;Cursor has metal frame. Adjustable metal end brackets. WKR  
Front scales: || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| Back scales: || Th, Sh2, Sh1, A || B, T<45o&T<45o, T>45o&T>45o, ST, S&S || D, DI, K||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
20 DIETZGEN (USA) Vector Type Log Log No. N1725 Micromatic   25 cm; Plastic face on wood ;Cursor has metal frame. Adjustable metal end brackets. WKR  
  This "Micromatic Adjustment" slide rule is the same as the N1725, Microglide, but has a special screw for fine adjusting of the alignment. This screw is located on the top scales on the far right end      
21 DIETZGEN (USA) Vector Type Log Log No. B-1725 (Made in Japan)   1972 25 cm.;Plastic face on laminated wood ;Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Th, Sh2, Sh1, A || B, T<45o&T<45o, T>45o&T>45o, ST, S&S || D, DI, K|| Back scales: || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
22 DING FENG (China) Slide Rule has no ID No. or name on it; Box has No. 5471 25 cm.; Plastic face on laminated wood; Cursor is framed; Adjustable metal end brackets. R. H. &  
Front scales:|| 2D, L, K, A || Tan&Cot, Sin&Cos, H, CI, C || D, Th, Sh1, Sh2 || CF and DF are folded at π. Back scales: || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| WKR  
  Gauge Marks on scales: on front C scale are the marks lo and R. On back p is on the DF scale.           Cursor Front and Back: has no marks.    
23a DING FENG (China) No. 5471 Duplex Vector   Source: Hopp page 161 25 cm.; Plastic face on laminated wood; Cursor is framed. PMH  
Front scales: || Th, L, K, A || B, S, H, T, C || D, DI, Sh2, Sh1 || Back scales: || LL01, LL02, LL03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| eBay  
  Gauge Marks on scales: Need information                 Cursor Front and Back: Need information.    
23b DING FENG (China) No. 5571   25 cm; Plastic face on laminated wood ;Cursor is not framed; Adjustable metal end brackets. R. H.
Front scales:|| 2D, L, K, A || Tan&Cot, Sin&Cos, H, CI, C || D, Th, Sh1, Sh2 || CF and DF are folded at √ 10 Back scales: || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1||
  Gauge Marks on scales: on front C scale has the mark R. On back p is on the DF scale.             Cursor Front and Back: has no marks.  
24a DING FENG (China) No. 5651   Scales were hard to read on eBAY, but seem similar to the one above with no ID No. eBay  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
24b DING FENG (China) No. 5810   25 cm; Plastic face on wood ;Cursor is not framed; Adjustable metal end brackets. R. H. &  
Front scales: || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at √ 10 Back scales: || Th, L, K, A || B, S&S, H', T&T, C || D, DI, Sh2, Sh1 || WKR  
  Gauge Marks on scales: p is on A, and B back scales; and C, D, and DF front scales; The marks 1 and R are on back scale C; unknown mark v is at 4.2 on K   Cursor Front and Back: has no marks.    
25 DING FENG (China) No. 5852   PVM  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
26 ECKEL (The Eckel Co., USA) Engineer's Log Log (Circular Slide Rule)   This is the only known circular slide rule with hyperbolic scales. Diameter about 8". Fahey  
  Scales are printed on cursor: Front from center to edge:|| LLI, LL2, LL3, LL4, C || D, DI, A, K, L || Back from center to edge: || SH1, SH2, TH, D, ST, S, T<45o, T>45o ||          
27 FABER-CASTELL (Germany) Mathema No. 2/84   1966 Source: Hopp page 172 20 cm.; Plastic, Cursor is not framed. Closed frame without brackets. SPHERE  
NOTE: The F-C Mathema rules do not use letters to name the scales such as, A, C, CIF, S, etc. Instead formulas or symbols are used to name the scales.  
Front Scales (on left side): || (eXg), tan xg, sqrt(X2 -1), sqrt X || sqrt X, (1 / sqrt X), 1/y, y || Y, sqrt( 1 - X2), sin Xg, (eX) || NOTE: This is based on 400g    
Front Scales(on right side):|| gln Y, gtanY, sqrt(1 + Y2), Y2 || y2, 1/y2, 1/y, y || Y, sqrt(1 - Y2), gsinY, (lnY) || system. Where, 400g = 2p.    
Back Scales (on left side): || -0'1 lnX, -lnX, -10 ln X || tanh xg, 0'1 cosh xg, 0'1 sinh xg, sinh xg || 10 ln X, lnX, 0'1 lnX || Then, 100g= p/2, and 1g= p/200    
Back Scales(on right side):|| e-10Y, e-Y, e-0,1Y || gtanh y, gcosh 10y, gsinh 10y, gsinh y || e0,1Y , eY, e10Y|| 1 Rad = 200g/p = 63.66198g    
Gauge Marks on scales: There are no gauge marks on the scales. p = usual value = 3.1415927    
Cursor Front : under the upper two sqrt X scales were two lines to the left at 2p and p/4; and to the right were two lines at 4p and p/2. These symbols were printed above on the cursor.  
Cursor Front (contined): under the lower two Y scales were two lines to the left at 2p and p/4; and to the right were two lines at 4p and p/2. These symbols were printed below on the cursor.  
  Cursor Back : under both the the upper and lower scales were two lines at left at 2p and p/4; and at right were two marks at 4p and p/2. These symbols were printed above and below on cursor.      
28 FABER-CASTELL (Germany) Mathema No. 2/84N   20 cm.; Plastic, Cursor is not framed. Adjustable metal brackets. SPHERE  
Front Scales (on left side): || (eXg), tan xg, sqrt(X2 -1), sqrt X || sqrt X, (1 / sqrt X), 1/y, y || Y, sqrt( 1 - X2), sin Xg, (eX) || NOTE: This is based on 400g    
Front Scales(on right side):|| gln Y, gtanY, sqrt(1 + Y2), Y2 || y2, 1/y2, 1/y, y || Y, sqrt(1 - Y2), gsinY, (lnY) || system. Where, 400g = 2p.    
Back Scales (on left side): || 10 ln X, lnX, 0'1 lnX, Y || y, 0'1 cosh xg, 0'1 sinh xg, sinh xg || tanh xg, -0'1 lnX, -lnX, -10 ln X || Then, 100g= p/2, and 1g= p/200    
Back Scales(on right side):|| e0,1Y, eY, e10Y , Y || y, gcosh 10y, gsinh 10y, gsinh y || gtanh y, e-10Y , e-Y, e-0,1Y|| 1 Rad = 200g/p = 63.66198g    
Gauge Marks on scales: There are no gauge marks on the scales. p = usual value = 3.1415927    
Cursor Front : under the upper two sqrt X scales were two lines to the left at 2p and p/4; and to the right were two lines at 4p and p/2. These symbols were printed above on the cursor.  
Cursor Front (contined): under the lower two Y scales were two lines to the left at 2p and p/4; and to the right were two lines at 4p and p/2. These symbols were printed below on the cursor.  
  Cursor Back : under both the the upper and lower scales were two lines at left at 2p and p/4; and at right were two marks at 4p and p/2. These symbols were printed above and below on cursor.      
29 FABER-CASTELL (Germany) 989 Complex Hyperbolic Function Calculator Source: Hopp page 172 ; Dieter von Jezierski and Peter Holland, OS Members in Germany helped me PMH  
with information on this very unique "Calculator" shown in the 1966 F-C catalog. It is very large; about 21 x 31 cm., and its picture shows a rule full of graphs of families of curves. Although it has two movable cursors to read Holland &  
values off of the graphs it works more like a nomograph than a slide rule. Peter sent me translations that Dieter had made of the manual. Using this device you can find solutions to equations involving complex hyperbolic D. v. J.  
  functions. Also, Richard Hughes, kindly sent me very clear and complete full size pictures of his F-C 989. (See his JOS article). Of interest is that all calculations are based upon the 400g system.   R. H.  
30 FLYING FISH (China) No. 1002     25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front scales: || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √ 10 Back scales: || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF; p/4 is on A and B; 1 and R are on C and D; v on K. Cursor Front: Has KW at top middle; HP(**) is at right and p/4 left over the A & B scales. Cursor Back: has no marks.    
31 FLYING FISH (China) No. 1003   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front Scales: || lnI-2, lnI-1, lnI0, lnI1, DF || CF, CIF, H0, H1, H'0, CI, C || D, ln1, ln0, ln-1, ln-2 || CF is folded at √ 10 Back scales: || sho, sh1, cu1, cu2, cu3 || lq1-1, tgoctgo, tg1ctg1, tg2ctg2, sinocoso, srt-1cos-1ctg-1, C || WKR  
  Gauge Marks on scales: p is on C, D, and DF; v and s are on CI. (Variations exist with v, v1, and s on scale C) Cursor Front and Back: has no marks. Back scales (Continued): || D, sq2, sq1, tho, ch1 ||    
32 FLYING FISH (China) No. 1004   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front scales: || Th, Ch, K, A || B, T&T, ST&ST, S&S, C || D, DI, Sh2, Sh1 || CF and DF are folded at p Back scales: || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| WKR  
  Gauge Marks on scales: p is on A, B, C, D, CF, and DF; p/4 is on A and B; v is on K. Cursor Front: Has KW at top middle; HP(**) is at right and p/4 left over the A & B scales. Cursor Back: has no marks.    
33 FLYING FISH (China) No. 1009   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front scales: || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, P, Th || CF is folded at √ 10 Back scales: || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF; p/4 is on A and B; v is on K. Cursor Front: Has KW at top middle; HP(**) is at right and p/4 on left over the A & B scales. Cursor Back: has no marks.    
34 FLYING FISH (China) No. 1015 and 1015-1   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. WKR  
Front scales: || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || CF is folded at √ 10 Back scales: || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1||  
  Gauge Marks on scales: p is on A, B, C, D,and DF.     Cursor Front: p/4 on left and HP(**) on right over the A & B scales.     Cursor Back: has no marks.    
35 FLYING FISH (China) No. 1018 Electricians slide rule   (See Shanghai China No. 1018) 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front Scales: || q, Rq, P', P || Q, QI, L, I || J, J', T, Gq || This has Gudermannian scales. Back Scales: || lnI-1, lnI0, lnI1, K1, A1 || B1, tgoctgo,sinocoso, C || D, DI, ln1, ln0, ln-1 || WKR  
  Gauge Marks on scales: p is on A1, B1, C, and D; p/4 is on A1 and B1; 1 and R are on scales C and D; 1/R is on B1 Cursor Front: has no marks. Cursor Back: p/4 on left and HP(**) on right over the A & B scales.    
36a FLYING FISH (China) No. 1200 (Pocket Slide Rule)   12.5 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front Scales: || lnI-1, lnI0, lnI1, DF || CF, CIF, sinocoso, H'0, CI, C || D, ln1, ln0, ln-1 || CF is folded at √ 10 Back scales: || sho, sh1, K, A || B, srt-1cos-1ctg-1, tgoctgo, tg1ctg1, tg2ctg2, C || D, lg-1, tho, ch1 || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF; R is on front C and D; v is on on K Cursor Front: has KW at top middle and HP(**) at right , and p/4 on left over the A & B scales. Cursor Back: has no marks.    
36b FLYING FISH (China) No. 6006 Electrical Engineering Slide Rule 1960 25cm.; Plastic; Cursor is framed. Adjustable metal brackets. From  
Front Scales: || db, Neper, Volt, Dynamo, A || B, T&T, S&S, C || D, K, P, L || Back scales: || Sh1, Sh2, Th, Ch, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Chinese  
Gauge Marks on scales: p is on A, B, C, D, and CI; p/4 is on A and B; C, 1, ', ", C1, and R are on scales C and D. There appear to be other marks that are unknown. Cursor Front: has three unknown marks. Internet  
  This slide rule was discovered on a Chinese Internet site. The pictures were clear enough to read the scales, but not clear enough to read all of the gauge marks on the scales and cursor. Cursor Back: has no marks. Site  
37a Gong Si He Ying (China) No Number (Called Rose Wood Slide Rule) 25cm.; Plastic face on wood ; Cursor is not framed. Adjustable metal brackets. Similar to K&E 4083-3 (1955-1961)  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The mark 1 is on scale SRT.         Cursor Front and Back: has no marks.    
37b GRAPHOPLEX (France) Neperlog Hyperbolic No. 691a 1962 26.45 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets and rubber feet. WKR  
Front scales: || L, P, Ch, A || B, T<45o & T<45o, ST & ST, S & S, C || D, Th, Sh2, Sh1 || Back scales: || LL01, LL02, LL03, DF || CF, CIF, K, CI, C || D, LL3, LL2, LL1 ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, CIF; 9', 9", r, and r " are on scales C and D, both Front and Back. Cursor Front: p /4 line is on left over the A & B; √ 4/p on right over C & D.  
  Cursor Front and Back: There are two lines over all scales on far right and left for the conversion to HP(**) by using C and D scales. Cursor Back: a mark on right over C and D scales for multiplication by 36 on CF and DF.    
38 HAIOU PAI (China) No. 6531   25cm.; Plastic; Cursor is not framed. Adjustable metal brackets. R. H.  
Front scales: || LL01, LL02, LL03, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1|| Back scales: || Th, K, A || B, T&T, ST, S&S, C || D, DI, Sh2, Sh1 ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, DI, and CIF.  
  Cursor Front: There is a mark on the right over the CF & DF scales for mutiplication of C and D by 36. Cursor Back: Has marks HP(**) at right , and p/4 on left over the A and B scales. On right over C and D scales is √ 4/p    
39a HAIOU PAI (China) No. 6631   PVM  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
39b HAIOU PAI (China) No. 6681 Haiou (Seagull)   25cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets on one side only. R. H. &  
Front scales: || LL01, LL02, LL03, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| Back scales: || L, Sh1, Sh2, A || B, T&T, ST, S&S, C || D, P, Th, Ch || WKR  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI, and CIF; ' and " are on ST.  
  Cursor Front: There is a mark on the right over the CF & DF scales for mutiplication of C and D by 36. Cursor Back: Has marks HP(**) at right , and p/4 on left over the A and B scales. On right over C and D scales is √ 4/p    
40 HANGZHOU JIANG or HANGZHOU JIANG SHI YI XING (China) No Number See Jiang 25 cm.; Photo plastic face on wood; Cursor is not framed. Is not duplex; no scales or cursor on back side. R. H.  
  This has same scales as JIANG 6171 (Pat. 129). Probably is same slide rule, but with different cursor. Cursor : Has two lines over C, D, CI, LL2, and LL3; with left line over 1, center line is over 1.19, and right line over 1.341.  
SEE THE NOTE AT END OF THIS LISTING REGARDING THE HEMMI SLIDE RULES.                  
41 HEMMI (Japan) Duplex Slide Rule No. 153 (For Electric Engineer) 1933-1966 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. WKR  
Front scales: || L, K, A || B, CI, C || D, T, Gq || Note: This is the first slide rule sold with Gudermannian hyperbolic scales. Back Scales: || q, Rq, P || Q, Q', C || LL3, LL2, LL1 ||  
Gauge Marks on scales: p, 2p, and marks c, ρ', ρ", and ρ are on front scales C and D. On back scales on far right of P is SIN, and on far right of Q is COS; e is on LL2 and LL3. Cursor Front & Back: no marks.  
  Note: A variation of this rule exists with identical scales but no number; except the Q' is in red. Also, variations of the regular rule exist where the far right number on the Gq scale ends in either 4 or 6, all else on the rules seems the same.
42 HEMMI (Japan) Duplex Slide Rule No. 154 (For Advanced Electric Engineer) 1933-1966 50cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. WKRM  
Front Scales: || DF, P' , P || Q, CF, CI, Sqo || A, D, K || Back Scales: || Sx, Tx, Tqo || Th, Sh, Sh, C || D, L, c || P. Ross  
  Gauge Marks on scales: p and mark c are on back scales C and D. NOTE: Rule has two cursors. Early version has scale letters eteched on cursor glasses.   Cursor Front & Back: no marks.    
43 HEMMI (Japan) Duplex Slide Rule No. 155 (For Advanced Electric Engineer) 1950 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. P. Ross  
Front scales: || K, A, DF || CF, B, CI, C || D, L || is folded at √ 10 Back scales: ||Sh1, Sh2, Th1 || TI1&TI1, TI2&TI2, SI1&SI1, C || D, DI ||  
  Need complete information with listing of details of scales, gauge marks and cursor lines.                      
44 HEMMI (Japan) Duplex Slide Rule No. 255 (For Expert Electric Engineer) 1951-1958 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. WKR  
Front scales: || L, K, DF || CF, CIF, CI, C || D, X , q || NOTE: X is radians and q is degrees. Version 1 Back scales: ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, LL3, LL2, LL1 || P. Ross  
  Gauge Marks on scales: p is on CF and DF and p/2 is on X and SI; mark c is on back scale C.             Cursor Front & Back: no marks.    
45 HEMMI (Japan) Duplex Slide Rule No. 255 (For Expert Electric Engineer) 1958-1966 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. P. Ross  
Front scales: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Version 2 Back scales: ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, X , q || X is radians; q degrees.  
  Need complete information with listing of details of scales, gauge marks and cursor lines.                      
46 HEMMI (Japan) Duplex Slide Rule No. 255D (For Expert Electric Engineer) 1966+ 25cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. WKR  
Front scales: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Back scales: ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, q || X is radians; q degrees.  
  Gauge Marks on scales: p is on CF and DF and p/2 is on X; Mark c is on back scale C; e is on LL2 and LL3.           Cursor Front & Back: no marks.    
47 HEMMI (Japan) Duplex Slide Rule No. 275 (For Advanced Electric Engineer) 1951-1958 50cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. P. Ross  
Front scales: || L, K, DF || CF, CIF, CI, C || D, X , q || NOTE: X is radians and q is degrees. Version 1 Back scales: ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, LL3, LL2, LL1 ||  
  Gauge Marks on scales: p is on CF and DF and p/2 is on X and SI; mark c is on back scale C.             Cursor Front & Back: no marks.    
48 HEMMI (Japan) Duplex Slide Rule No. 275 (For Expert Electric Engineer) 1958-1966 50cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. P. Ross  
Front scales: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Version 2 Back scales: ||Sh1, Sh2, Th, A || B, TI2, TI1, SI, C || D, X , q || X is radians; q degrees.  
  Need complete information with listing of details of scales, gauge marks and cursor lines.                      
49 HEMMI (Japan) Duplex Slide Rule No. 275D (For Advanced Electric Engineer) 1966+ 50cm.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. P. Ross  
Front scales: || L, K, DF || CF, CIF, CI, C || D, LL3, LL2, LL1 || Back scales: ||Sh1, Sh2, Th, A || B, TI2&TI2, TI1&TI1, SI&SI, C || D, DI, X, q || X is radians; q degrees.  
  Gauge Marks on scales: p is on CF and DF and p/2 is on X; Mark c is on back scale C.     NOTE: Rule has two cursors.     Cursor Front & Back: has no marks.    
50 HUA FANG (China)     No Number       Need complete information with listing of details of scales, gauge marks and cursor lines. PVM  
51 JIANG (China) JIANGSHI type B No. 6171 PAT 129 Designed by Jiang Dequ 1940 25 cm.; Photo plastic face on wood; Cursor is framed. Is not duplex; no scales or cursor on back side. R. H. &  
Scales listed on left side: || LL1, CU, (T)&(T) || B, S&S, SH, CI, C || D, LL2, LL3|| Scales listed on right side: || LL1, L, CT || B, CS, TH, C || D, LL2, LL3|| WKR  
Gauge Marks on scales: The marks r , and ' and " are on scales C and D.  
  Note: There are a number of various gauge marks, scale markings, and auxillary small scales used to calculate hyperbolic functions and other unknown values.                         Cursor: has no marks.    
SEE THE NOTE AT END OF THIS LISTING REGARDING THE K&E SLIDE RULES.                  
52 KEUFFEL & ESSER (USA) Log Log Vector No. 4093-3 1929-1935 & 1936-1938 10 in.; Plastic face on wood ; early Cursor was not framed; later was framed. Adjustable metal brackets. MOL  
Front scales: || L, LL0, DF || CF, B, CI, C || D, LL3, LL2|| Note: This is the first slide rule sold with hyperbolic scales. Back scales: || Sh1, Sh2, Th || SI1&SI1, SI2&SI2, TI&TI || D, S, T || WKR  
  Gauge Marks on scales: On Front Scales: p is on B, CF, and DF; p/4 is on B; marks ' and ", and R are on scales C and D.       Cursor Front and Back: has no marks.    
53 KEUFFEL & ESSER (USA) Log Log Vector No. 4093-5   1934-1938 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || L, LL0, DF || CF, B, CI, C || D, LL3, LL2|| Note: This is the first 20 inch sold with hyperbolic scales. Back scales: || Sh1, Sh2, Th || SI1&SI1, SI2&SI2, TI&TI || D, S, T ||  
  Gauge Marks on scales: On Front Scales: p is on B, CF, and DF; p/4 is on B; marks ' and ", and R are on scales C and D.       Cursor Front and Back: has no marks.    
54 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 1939-1946 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
55 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 1947-1948 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
56 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-3 1949-1952 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
57 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-3 1953 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
58 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 1954-1954 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
59 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-3 1955-1961 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The mark 1 is on scale SRT.         Cursor Front and Back: has no marks.    
60 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 68 1424 & 68 1429 (4083-3) 1962-1967 10 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Identical rules with different color cases Back scales: || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The mark 1 is on scale SRT.         Cursor Front and Back: has no marks.    
61 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 1939-1946 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
62 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 1947-1948 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
63 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-5 1949-1952 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || L, LL01, LL1, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
64 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. N4083-5 1953 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 ||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
65 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 1954-1954 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S || D, DI, LL01, LL1 ||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
66 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 4083-5 1955-1961 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 || WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The mark 1 is on scale SRT.         Cursor Front and Back: has no marks.    
67 KEUFFEL & ESSER (USA) Log Log Duplex Vector No. 68 1424 & 68 1429 (4083-5) 1962 20 in.; Plastic face on wood ; Cursor is framed. Adjustable metal brackets. MOL  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2|| Identical rules with different color cases Back scales: || Sh1, Sh2, Th, A || B, T&T, SRT, S&S || D, DI, LL01, LL1 ||  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The mark 1 is on scale SRT.         Cursor Front and Back: has no marks.    
68 KEUFFEL & ESSER (USA) KELON (This 10 in. Rule was designed, but not produced) ( Information furnished by Joe Maskin from June 1999 article by Wayne Feeley ). Maskin  
Front scales: || Ln-3, Ln-2, Ln-1, Ln-0, DF || CF, CIF, L, CI, C || D, Ln0, Ln1, Ln2, Ln3 || Back scales: || Constants, Sh1, Sh2, Th, A || B, T1&T1, SRT, SI2&SI2, C || D, DI, K, Sq1, Sq2 ||  
  Discussed at K&E for including on the KELON was more gauge marks, a magnifying lens built into the cursor, greater use of color on the scales, and using a folded scale at sqrt 10.        
69 LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. F - 686   25 cm.; Plastic face on laminated wood ; Cursor is not framed. Adjustable metal brackets. WKR  
Front scales: || Tr1, Tr2, P, P || Q, ST, Sr, Sq, C || D, LLo3 LLo2, Llo1 || Note: Sr is radians; Sq is degrees. Back scales: || Sh1, Sh2, DF, A || B, CF, Th, CI, C || D, LL3, LL2, db || Note: db is 20 lg x  
  Gauge Marks on scales: p is on C, D, CF,and DF; C is on Cand D; (Variations exist with p and M on A & B; and C1 and ro on C&D)       Cursor Front and Back: has no marks.    
70 LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. 99-7102   25 cm.; Plastic face on laminated wood ; Cursor is not framed. Adjustable metal brackets. WKR  
Front scales: || Tr1, Tr2, P, P || Q, ST, Sr, Sq, C || D, LLo3 LLo2, Llo1 || Note: Sr is radians; Sq is degrees. Back scales: || Sh1, Sh2, DF, A || B, CF, Th, CI, C || D, LL3, LL2, db || Note: db is 20 lg x  
  Gauge Marks on scales: None on Front scales; On back p is on C, D, CF, and DF; C and ro are on C and D. (Other variations of gauge marks may exist).   Cursor Front and Back: has no marks.    
71a LAFAYETTE (USA / JAPAN San - AI Group) VECTORLOG No. 99-71029     Same as No. 99-7102 with slight variations of size of markings on some of the scales. WKR  
71b LUTZ ( JAPAN / USA) No. 300 B     25 cm.; Plastic face on laminated wood ; Cursor is not framed; Adjustable metal brackets. S.T.  
Front scales: || Sh1, Sh2, Th, A || B, T&T, ST&ST, S&S, C || D, DI, P, K || Back scales: || LL1, LL2, LL3, DF || CF, CIF, L, CI, C || D, LL3, LL2, LL1||  
  Gauge Marks on scales: p is on front C, D, CF, and DF; C and ρ are on C and D front.             Cursor Front and Back: has no marks.    
72 MICRONTA (JAPAN) No. 157   25 cm.; Plastic face on laminated wood ; Cursor is not framed; Adjustable metal brackets. WKR  
Front scales: || Sr, Sq, P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: Sr is radians; Sq is degrees. Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x  
  Gauge Marks on scales: p is on A, B, C, D, CF and DF; p/4 and M are on A and B; c and c1 are on C and D; e is on LL2 and LL3       Cursor Front and Back: has no marks.    
73 MICRONTA ( JAPAN San - AI Group) No. 1157 Electric Vector   25 cm.; Plastic face on laminated wood ; Cursor is not framed; Adjustable metal brackets. WKR  
Front scales: || Sr, Sq & Sq , P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Note: Sr is radians; Sq is degrees. Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x  
Gauge Marks on scales: p is on A, B, C, and D; M is on A and B; C and C1 are on C and D. Cursor Front: has no marks.  
  Cursor Back: has marks; KW at top middle ; HP(*) is at right on vertical line over A & B scales; p /4 is at a vertical line on left over the A & B scales, and 4/p on the right over the C & D scales.      
74a NIKKEI (JAPAN Nippon Slide Rule Co.) NIKKEI 520 Duplex   D.D.  
Front scales: || L, K, DF || CF, CIF, CI, C || D, X, q || Note: X is radians; q degrees Back scales: || Sh1, Sh2, Th, A || B, T, S, ST, C || D, LL1, LL2, LL3 ||  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information with listing of details of scales, gauge marks and cursor lines.          
74b Paper Slide Rule (CHINA) No Number and unknown Name   25 cm.; Paper face glued to wood ; Cursor is not framed; Adjustable metal brackets. R. H. &  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Very crudely made - scales are all black color Back scales: || LL0, LL00, A || B, T, ST, S || D, Th, Sh2, Sh1|| Similar to early K&E 4083-3 (1939-1946) WKR  
  Gauge Marks on scales: p is on A, B, CF, and DF; p /4 is on A and B scales; The marks 1, ' and " are on scale ST.         Cursor Front and Back: has no marks.    
75 PATRICK Corp/ (USA) MARK IV data log   10 in.; Plastic; Cursor is not framed. Adjustable Metal Brackets WKR  
Front scales: || K, odd √ , even √ , A || B, T & T, ST, S & S, C || D, DI, Th, Sh2, Sh1|| Back scales: ||LL0 +, LL0 -, LL1 +, LL1 -, DF || CF, CIF, L, CI, C || D, LL2 +, LL2 -, LL3 +, LL3 - ||  
Gauge Marks on scales: p is on A, B, C, D, CF, DF, CI and DI; p is shown as a mark on CIF; R is on C, D, CI and DI. R is shown as a mark on CF, DF, and CIF;  
  Gauge Marks on scales (Continued): e is shown as a mark on the front C and D, and on CIF; the ST scale shows 1 mark, and and a second mark . Cursor Front and Back: has no marks.    
SEE THE NOTE AT END OF THIS LISTING REGARDING THE PICKETT SLIDE RULES.                  
76 PICKETT & ECKEL (USA) Model 4 Deci - Log Log Vector Hyperbolic   25 cm.; White plastic film over Magnesium alloy, Cursor is not framed, Adjustable metal brackets. MOL  
Front scales: || 1/N1, 1/N2, 1/N3, 1/N4, DF || CF, Th, Sh, Sh, CI, C || C0 & D, N1, N2, N3, N4 || Back scales:||Three cubert scales 3√ , DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || WKR  
  Gauge Marks on scales: p is on C, D. Also on CF and DFon the front scales; marks 1 , " at 1.18, and ' at 1.97, are on ST.       Cursor Front and Back: has no marks.    
77 PICKETT & ECKEL (USA) Model No. 4 Vector Hyperbolic Log Log   25 cm.; White plastic film over Magnesium alloy, Cursor is not framed, Adjustable metal brackets. MOL  
Front scales:||Three cubert scales 3√ , DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back scales: || 1/N1, 1/N2, 1/N3, 1/N4, DF/M || CF/M, Th, Sh, Sh, CI, C || C0 & D, N1, N2, N3, N4 || WKR  
  Gauge Marks on scales: p is on C, D. Also, CF, DF on the front scales. ; R is shown on front C and D; marks 1, ' and " are on ST       Cursor Front and Back: has no marks.        
78 PICKETT & ECKEL (USA) Model 4-T Dual-Base Log Log (Vector Hyperbolic) 25 cm.; White plastic film over Aluminum, Cursor is not framed, Adjustable metal brackets. MOL  
(Same rules with different colors) Model 4-ES Dual-Base Log Log (Vector Hyperbolic) 25 cm.; Yellow plastic film over Aluminum, Cursor is not framed, Adjustable metal brackets. WKR  
Front scales:||Three cubert scales 3√ , DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back: || LL1&LL1, LL2&LL2, DF || CF, Th, Sh&Sh, L, CI, C || D, LL3&LL3, LL4&LL4 ||  
  Gauge Marks on scales: p is on C, D, CF, DF, CF/M, DF/M, CI, DI, CIF ; R and p/4 are on C & D; marks 1, ' and " are on ST.                   Cursor Front and Back: has no marks.    
79 PICKETT & ECKEL (USA) Model 4-T Dual-Base Log Log Reciprocal Scale (Vector Hyperbolic) 25 cm.; White film over Aluminum, Cursor is not framed, Adjustable metal brackets. MOL  
(Same rules with different colors) Model 4-ES Dual-Base Log Log Reciprocal Scale (Vector Hyperbolic) 25 cm.; Yellow film over Aluminum, Cursor is not framed, Adjustable metal brackets. WKR  
Front scales:||Three cubert scales 3√ , DF|| CF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back: || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, L, CI, C || D, LL3&LL3, LL4&LL4 ||  
  Gauge Marks on scales: p is on C, D, CF, DF, CF/M, DF/M, CI, DI, CIF ; R and p/4 are on C & D; marks 1, ' and " are on ST.       Cursor Front and Back: has no marks.    
80 PICKETT & ECKEL (USA) Model N4-T Vector Type LOG LOG Dual - Base Speed Rule 25 cm.; White film over Aluminum, Cursor is not framed, Adjustable metal brackets. MOL  
(Same rules with different colors) Model N4-ES Vector Type LOG LOG Dual - Base Speed Rule 25 cm.; Yellow film over Aluminum, Cursor is not framed, Adjustable metal brackets. WKR  
Front:||Three cubert scales 3√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back: || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 ||  
  Gauge Marks on scales: p, p/4, and R are on C, D, CF, DF, CF/M, DF/M, CI, DI, and CIF; e is on C and D; and marks 1, ' and " are on ST.     Cursor Front and Back: has no marks.    
81 PICKETT & ECKEL (USA) Model N4p-T Vector Type LOG LOG Dual - Base Speed Rule 12.5 cm.; White film over Aluminum, Cursor is not framed, Adjustable metal brackets. MOL  
(Pocket version, same ruleswith different colors) Model N4p-ES Vector Type LOG LOG Dual - Base Speed Rule 12.5 cm.; Yellow film over Aluminum, Cursor is not framed, Adjustable metal brackets. WKR  
Front:||Three cubert scales 3√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back: || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 ||  
  Gauge Marks on scales: p, p/4, and R are on C, D, CF, DF, CF/M, DF/M, CI, DI, and CIF; e is on C and D; and marks 1, ' and " are on ST.     Cursor Front and Back: has no marks.    
82 PICKETT & ECKEL (USA) Model N16-ES ELECTRONIC LOG LOG Dual - Base Speed Rule 25 cm.; Yellow film over Aluminum, Cursor is not framed, Adjustable metal brackets. WKR  
Front scales:|| SH1, SH2, TH, DF || CF, L, S&S, ST, T&T, CI, C || D, LL3, LL2, LL1, Ln || Back: || Q & Q, db & db, D or Q, XL, Zs OR Xc || C or L, F, l, v, t, tR' or X'c, Cr || (see continued below)  
Back scales (continued): || Lr, db & db, COS Q & COS Q, t'C or C' || (NOTE: Both the tR' or X'c and the t'C or C' scales include numerous sub-scales for solving electronic calculations).  
  Gauge Marks on scales: p is on C, D, CF, DF, and CI; R, p/4, sqrt √ of 2, and 1/sqrt √ of 2, are on C & D scales; e is on LL2 and LL3; the marks ' and " are on ST. Cursor Front and Back: has no marks.    
83 PICKETT & ECKEL (USA) Model X-4 Vector Type LOG LOG Dual - Base Speed Rule 25 cm.; Brown, with white slide piece, Cursor is framed, Adjustable metal brackets. American  
Front:||Three cubert scales 3√ , DF || CF, CIF, T&T, ST, S&S, CI, C || D, DI, Two sqrt scales √ || Back scales: || LL1&LL1, LL2&LL2, DF/M || CF/M, Th, Sh&Sh, Ln, L, CI, C || D, LL3&LL3, LL4&LL4 || Artifacts;  
  Gauge Marks on scales: p, p/4, and R are on C, D, CF, DF, CF/M, DF/M, CI, DI, and CIF; e is on C and D; and marks 1, ' and " are on ST. (Comes in plush box). Cursor Front and Back: has no marks. Web Site  
84 POST (USA)     Log Log Vector Model No. 1460 (Same as Hemmi 154)               P. Ross  
85a POST (USA) Log Log Vector Model No. 1461 (Similar to Hemmi 153) 10 in.; Plastic face on laminated wood ; Cursor is framed. Adjustable metal brackets. WKR  
Front scales: || L, K, A || B, CI, C || D, T, Gq || Note: has Gudermannian hyperbolic scales. Back Scales: || q, Rq, P || Q, Q', C || LL3, LL2, LL1 || Cursor Front and Back: has no marks.  
  Gauge Marks on scales: p , 2p , R, with marks C & C1, ' and ", are on front scales C and D; p, p/4, and M are on A and B scales; p is on CI. On back scales on far right of P is SIN, and on far right of Q is COS; e is on LL2 and LL3    
85b PRECISION SCALE (USA)[1]   Model 1751 Log Log 10 Hyperbolic       25 cm.; White film or Yellow film version over metal, Cursor is missing, Non-adjustable metal brackets.             WKR  
Front scales: || K, L, DIF, DF || CF, CIF, Two sqrt scales √(odd & even), CI, C || D, DI, TH, SH1, SH2 || Back scales: || LL1, LL2, LL3, LL4, A || B, S&S, ST&ST, T&T, CI, C || D, LL/1, LL/2, LL/3, LL/4 ||  
Gauge Marks on scales: p, p/4, and R are on C, D, CF, DF, CI, DI, and CIF; p & p/4 are on A and B; and marks 1, ' and " are on ST.   Cursor is missing. Note: This rule was desiged and manufactured but never sold.      
85c PRECISION SCALE (USA)[2]   Model 1752 Log Log e Hyperbolic       25 cm.; White film or Yellow film version over metal, Cursor is missing, Non-adjustable metal brackets.             WKR   [3]
Front scales: || Sh1, Sh2, Th, A || B, T&T, ST, S&S, CI, C || D, DI, K, L || Back scales:||LL/0, LL/1, LL/2, LL3, DF || CF, CIF, Two sqrt scales √(odd & even), CI, C || D, LL3, LL2, LL1, LL0||  
  Gauge Marks on scales: p, p/4, and R are on C, D, CF, DF, CI, DI, and CIF; p & p/4 are on A and B; and marks 1, ' and " are on ST.   Cursor is missing. Note: This rule was desiged and manufactured but never sold.  
85d QUIFAN (CHINA) Rose Wood Slide Rule Has no Model No. ( QUIFAN Instrument Industrial Group).   See Gong Si He Ying No. 37a on this list        
86 REISS (East Germany) Duplex Model 3227   1966 25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. WKR  
Front scales: || LL00, LL01, LL02, LL03, DF || CF, CIF, BI, CI, C || D, LL3, LL2, LL1, LL0 || Back scales: || K, T1, T2, DI, A || Sh1, Sh2, Th, SZ ,C || D, SK, P, ST, L ||  
  Gauge Marks on scales: p is on A, C, D, DF, CF, CI, DI, and CIF; Q9 and Qo are on the front scale DF, and back D scale; e is on LL2 and LL3     Cursor Front and Back: has no marks.    
SEE THE NOTE AT END OF THIS LISTING REGARDING THE RELAY / RICOH SLIDE RULES.                  
87 RELAY (Japan San - Ai Group) No. 157   25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Sr, Sq, P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lg x  
  Gauge Marks on scales: p is on A, B, C, D, CF,and DF; M is on A and B; C and C1 are on C and D; p/4 is on the A & B scales; e is on LL2 and LL3.   Cursor Front and Back: has no marks.    
88a RELAY (Japan San - Ai Group) No. 158   25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Sh2, Sh1, Th, A || BI, S, T, CI, C || D, DI, LL3, LL2, LL1 || Back Scales: || X2, X1, P2, P1 || Q, Y, L, LX, I || I, Lq1&Lq1, Lq2&Lq2, LY ||  
  Gauge Marks on scales: p is on A, C, and D; 2p is on C and D; C1 is on C and D; Marks , ρ', ρ" and ρ0 are on C and D; p/2 is on Y; e is on LL2 and LL3.   Cursor Front and Back: has no marks.    
88b RELAY (Japan San - Ai Group) Model No. De 1008   Similar to No. 158 (see 1957 Catalog) D.D.  
Front scales: || Sh2, Sh1, Th, A || BI, S, T, CI, C || D, DI, LL3, LL2, LL1 || Back Scales: || X2, X1, P2, P1 || Q, Y, L, LX, I || I, Lq1&Lq1, Lq2&Lq2, LY ||  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
89 RICOH (Japan San - Ai Group) No. 157   25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Sr, Sq, P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lgx Note: Is similar to Relay No. 157  
  Gauge Marks on scales: p is on A, B, C, D, CF,and DF; M is on A and B; C and C1 are on C and D; p/4 is on the A & B scales; e is on LL2 and LL3.   Cursor Front and Back: has no marks.    
90 RICOH (Japan San - Ai Group) No. 158   D.D.  
Front scales: || Sh2, Sh1, Th, A || BI, S, T, CI, C || D, DI, LL3, LL2, LL1 || Back Scales: || X2, X1, P2, P1 || Q, Y, L, LX, I || I, Lq1&Lq1, Lq2&Lq2, LY || Note: Is similar to Relay No. 158  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
91 RICOH (Japan San - Ai Group) Model No. 159   Have manual copy from Scott Pawelka, but it does not have picture of rule. Assume it is like other Ricohs. WKRM  
Front scales: || LL-1, LL-2, LL-3, A || B, BI, CI, C || D, LL3, LL2, LL1 || Back scales: || Sh1, Sh2, P2, P1 || Q, Sr, Sq, Th, C || D, T2, T1, L || Note:Sr is radians; Sq degrees  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
92a RUYI (Chinese Shanghai)   Model No. 1002     25 cm.; Plastic; Cursor is not framed. Has adjustable metal brackets.   Similar to Flying Fish 1002 R. H. &  
Front scales: || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √ 10 Back scales: || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF; p/4 is on A and B; 1 and R are on C and D; v on K. Cursor Front: Has KW at top middle; HP(**) is at right over the A & B scales. Cursor Back: has no marks.    
92b RUYI (Chinese Shanghai)   Model No. 1009                 Same as Flying Fish 1009 R. H.  
92c RUYI (Chinese Shanghai) Model No. 1015-1   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. R. H. &  
Front scales: || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √ 10 Back scales: || Sh1, Sh2, K, A || B, T&T, ST, S&S, C || D, DI, L, Th || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF.         Cursor Back: has marks HP(**) on right, and p/4 on left over A & B scales. Cursor Back: has no marks.  
92d RUYI (Chinese Shanghai) Model No. 1083   25 cm.; Plastic; Cursor is framed. Adjustable metal brackets. R. H. &  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| CF and DF are folded at √ 10 Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| Similar to early K&E 4083-3 WKR  
  Gauge Marks on scales: p is on A, B, CF and DF; marks 1, ' and " are on ST.             Cursor Front and Back: has no marks.    
93 RUYI (Chinese Shanghai) Model No. 6201   Seems to be the same as SIDA Model 6201 eBay  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
94 SCIENTIFIC INSTRUMENT COMPANY (SIC) (USA) Electro-Vector Log-Log No. 1570   25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Sr, Sq&Sq, P, P || Q, CF, CI, C || D, DF, LL2, LL3 || Back scales: || Sh2, Sh1, A || B, K, Th, C || D, Tr1, Tr2, db || Note: db is 20 lgx Note: Is similar to Relay No. 157  
  Gauge Marks on scales: p is on A, B, C, D, CF,and DF; M is on A and B; C and C1 are on C and D; p/4 is on the A & B scales; e is on LL2 and LL3. Cursor Front and Back: has the scale names imprinted, but no gauge marks.  
95 SCIENTIFIC INSTRUMENT COMPANY (SIC) (USA) Vector Log-Log No. 1580   25 cm.; Plastic face on laminated wood ; Cursor not framed. Adjustable metal brackets. WKR  
Front scales: || Sh2, Sh1, Th, A || BI, S&S, T&T, CI, C || D, DI, LL3, LL2, LL1 || Back Scales: || X2, X1, P2, P1 || Q, Y, L, LX, I || I, Lq1&Lq1, Lq2&Lq2, LY || Note: Is similar to Relay No. 158  
Gauge Marks on scales: p is on A, C, and D; 2p is on C and D; C1 is on C and D; Marks , ρ', ρ" and ρ0 are on C and D; p/2 is on Y; e is on LL2 and LL3; to the far left of the LL2 scale is the symbol qx.  
  Cursor Front and Back: has no gauge marks; however the scale names are imprinted on the cursor on the left hand of each side, and each of the ranges of the S, T, CI, LL1, LL2, and LL3 scales are shown on the right hand side.    
96a SHANGHAI (China)     Model No. 1002 There is no name on this slide rule, only the number 1002.   Seems to be the same as Flying Fish 1002 WKR  
96b SHANGHAI (China)     Electricians Slide Rule No. 1018   Source: Hopp page 218.   Same as Flying Fish 1018     WKR  
97 SHANGHAI (China) Model No. 5891     This has same scales as K&E 4083-3 (1955 Model) See listing under China Shanghai 5891 eBay  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
98 SIDA (China) Model No. 1   Source: Hopp page 218 25 cm.; Plastic, Cursor is not framed. Adjustable metal brackets. PMH  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1||  
  Need complete information with listing of details of scales, gauge marks and cursor lines.                      
99 SIDA (China) Model No. 1002   25 cm.; Plastic, Cursor is not framed. Adjustable metal brackets. Similar to Flying Fish & Ruyi 1002 R. H. &  
Front scales: || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √ 10 Back scales: || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF. Marks 1o and R are on back scales C and D; p/4 is on A and B; v is on K. Cursor Front: no lines. Cursor Back: has line HP(**) on right over A and B scales.  
100a SIDA (China)     Model No. 1009     Same as Flying Fish 1009           R. H.
100b SIDA (China) Model No. 1012   PVM  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
101 SIDA (China) Model No. 1015   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. PVM  
Front scales: || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √ 10 Back scales: || Sh2, Sh1, K, A || B, T&T, ST, S&S, C || D, DI, L, Th ||  
  Gauge Marks on scales: p is on A, B, C, D, and DF.                 Cursor Front and Back: has no marks.    
102 SIDA (China) Model No. 1015 - 1   25 cm.; Plastic; Cursor is not framed. Has fixed plastic end brackets. PVM  
Front scales: || LL/1, LL/2, LL/3, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF is folded at √ 10 Back scales: || Sh2, Sh1, K, A || B, T&T, ST, S&S, C || D, DI, L, Th ||  
  Gauge Marks on scales: p is on A, B, C, D, and DF.           Cursor Front: no lines. Cursor Back: has marks HP(**) on right, and p/4 on left over A & B scales.  
103a SIDA (China) Model No. 1083   25 cm.; Plastic face on laminated wood; Cursor is framed. Adjustable metal brackets. R. H. &  
Front scales: || L, LL1, DF || CF, CIF, CI, C || D, LL3, LL2|| Back scales: || LL0, LL00, A || B, T&T, ST, S&S || D, Th, Sh2, Sh1|| Similar to early K&E 4083-3 (1939-1946) WKR  
  Gauge Marks on scales: p is on A, B, CF and DF; p/4 is on A & B; marks 1, ' and " are on ST.           Cursor Front and Back: has no marks.    
103b SIDA (China) Model No. 5810   25 cm; Plastic face on wood ;Cursor is not framed; Adjustable metal end brackets. R. H.  
Front scales: || LL1I, LL2I, LL3I, DF || CF, CIF, H, CI, C || D, LL3, LL2, LL1|| CF and DF are folded at √ 10 Back scales: || Th, L, K, A || B, S&S, H', T&T, C || D, DI, Sh2, Sh1 || Similar to Ding Feng 5810  
  Gauge Marks on scales: p is on A, B, C, D, and DF; 1o and R are on A, B, and C.             Cursor Front and Back: has no marks.    
104 SIDA (China) Model No. 6171   25 cm.; Plastic; Cursor is not framed. Adjustable metal brackets. PVM  
Front scales: || Ln1I, Ln2I, Ln3I, DF || CF, CIF, H2, H3, CI, C || D, Ln3, Ln2, Ln1|| CF is folded at √ 10 Back scales: || sh2, sh3, K, A || B, sin2cos2, H'2, tg2ctg2, tg3ctg3, C || D, DI, lg, th2 ||  
  Gauge Marks on scales: p is on A, B, C, D, and DF; 1o and R are on C&D.     Similar to SIDA 1002. Cursor Front: has HP(**) line on right. Cursor Back: has no lines    
105 SIDA (China) Model No. 6201   25 cm.; Plastic on laminated wood; Cursor is framed. Adjustable metal brackets. WKR  
Front scales: || L, K, A || B, T&T, ST, S&S, C || D, Sh2, Sh1, Th || Back scales: || LLo1, LLo2, LLo3, DF || CF, CIF, CI, C || D, LL3, LL2, LL1|| (See also RUYI 6201)  
  Gauge Marks on scales: p is on A, B, C, D, CI, CF and DF; p/4 is on A & B; c is on C; marks 1, ' and " are on ST         Cursor Front and Back: has no marks.    
SUN (Japan) (for Cross Reference See HEMMI)                        
106 U. S. BLUEPRINT (USA/HEMMI) No. 1893 Duplex Slide Rule (For Electric Engineer) Note: Has Gudermannian scales Same as Hemmi 153     P. Ross  
107 XUESH (China) 6171 bachelor   PVM  
  Do not have a picture or manual for this slide rule. Hopp does not list it. Need complete information: listing of details of dimensions, physical appearance, scales, gauge marks,cursor lines, etc.      
108 XUESH (China) 6171   25 cm.; Plastic on laminated wood; Cursor is not framed. Adjustable metal brackets. R. H. &  
Front scales: || lgln1I, lgln2I, lgln3I, DF || CF, CIF, H1, H2, CI, C || D, lgln3, lgln2, lgln1|| CF is folded at √ 10 Back scales: || sh1, sh2, K, A || B, sin&sin, H1 tg1&tg1, tg2&tg2, C || D, DI, lg, th || WKR  
  Gauge Marks on scales: p is on A, B, C, D, and DF; p/4 is on A&B; 1o and R are on front C&D; v is on K; CF and DF are folded at √ 10 on right side.   Cursor Back: has HP(**) line on right.    
109 XUESHI (China) 1572-K3 (Maybe XUESH, see above)   25 cm.; Plastic on laminated wood; Cursor is framed. Adjustable metal brackets. R. H.  
Front scales: || LL02, LL03, DF || CF, CIF, CI, C || D, LL3, LL2 || Back scales: || Sh1, Sh2, Th, A || B, T, SRT, S || D, DI, LL01, LL1||  
  Gauge Marks on scales: p is on CF and DF.                 Cursor Front and Back: has no marks.    
 
NOTES :  
On this list the "Front" of the slide rule is where the Name and Number are most prominently displayed. The "Front Cursor" is also on this side. There are exceptions, such as where the name was on one side and the number on the  
other. On some, where I had a copy of the instruction manual available, it said what was Front and Back. Where there are two entries such as "S & S" it denotes there are Black and Red numbers on the same scale. This makes the scale  
actually two scales. Usually one being the complement of the other. As examples, in the case of "S & S" the degrees are shown as 10 80, and 70 20, etc. At least one rule has Black and Black complementary numbers. However, all scales  
are in black where I do not own or have a color picture of the slide rule.  
The CF and DF scales are all folded at p, unless noted that they are folded at 10, or other value.  
 
The values of the symbols and gauge marks on the slide rule scales and on the cursors are as follows: (Note: Do not be confused as some marks look similar, but can have different values).    
Note: Not all gauge marks could be identified. Instead, where a mark is unknown, a numerical value is shown.  
p = 3.14159  
p / 4 = 0.7854 This is to aid in finding the area of a circle by the formula; A = p D2 /4  
v = p/6 = 0.5236 This mark is on K scale and is used for calculating volume of sphere where V = (p/6) D3  
R or ρo or ρ = 180/p = 57.2958o (the degrees in one radian)  
M = 1 / p = 0. 3183, or 100 / p = 31.83  
C or C' = 4/p = 1.273  
c or C = (√ 4/p) = 1.128  
C1 = (√ 40/p) = 3.568  
Marks for small angle calculations are usually on ST and read on C: 1o = 1.745 * 10 -2 = p / 180 ; The sine of one minute is = 2.909 * 10 -4 ; the sine of one second is = 4.848 * 10 -6  
' or ρ' or 9' or δ' or ζ' or Q' = minutes in a radian = 3437.74 = (180 x 60)/p If the mark ' is = 1.970, it is = 206,265 * (180/p) / 60 = 1.97 * 10 5 ; Where, 206,265 = (180 x 60 x 60) / p  
" or ρ" or 9" or δ" or ζ" or Q" = seconds in a radian = 206,265 = (180 x 60x 60)/p If the mark is = 1.182, it is = 206,265 * (180/p) = 1.182 * 10 7 ; Where, 206,265 = (180 x 60 x 60) / p  
ρ" or δ2 or ζ2 or Q2 = seconds in a radian (French decimal system 400) = 636,620 = (200 x 100 x 100)/p  
KW or kW stands for Kilowatts. HP(*) stands for Horsepower in U.S. and Great Britain. HP(**) for Horsepower in Continental Europe.  
HP(*) (value for this mark is = 1.341). Conversions are: Kilowatts (KW) times 1.341= HP(*); Ergs per Second times 1.341 times 10-10 = HP(*).  
HP(**) (value for this mark is = 1.358) for HP metric.  
PS1 = factor is 1.33413  
PS2 = factor is 1.3599 (this is for HP metric)  
 
 
SOURCES OF INFORMATION AND ACKNOWLEDGEMENTS (These are shown on the far right of the individual slide rule listing, and others are noted below):  
D.D. - David Davis - from his web site of the "Relay/Ricoh Archive" listing of slide rules.  
clara.co - from Ron Manley's web site, "www.sliderules.clara.co.uk".  
eBay - from pictures and listings of slide rules on eBay.  
Fahey - John Fahey - from pictures he furnished to me on the Eckel Circular side rule.  
HVH - many of the listings were checked to Herman Van Herwijnens listing of slide rules on his CD's. These many cross-checks are not listed. However, Herman's immense contibution to slide rule knowledge needs to be remembered.  
Holland & D.v.J. - from Peter Holland and Dieter von Jezierski - email pictures, and copies of the translation of the manual by Dieter, of the Faber-Castell 989.  
JOS - The Journal of the Oughtred Society, and JOS PLUS is on the OS web site.  
J. R. G. - from information sent to me by Joo Roberto Gabbardo on the Archimedes slide rule.  
MOL - Michael O'Leary and Clark McCoy- from email pictures Michael sent the Author on K&E and Pickett slide rules; and from Clark's web site on K&E slide rules and catalogs.  
P. Ross - Paul Ross - from his Article in Spring 2003, Journal of the Oughtred Society;"A Comprehensive Hemmi Slide Rule Catalog".  
PMH - from Peter M. Hopp's, book, "SLIDE RULES Their History, Models, and Makers", Astragal Press, 1999.  
PVM - from Pierre Vander Meulen's article on "Hyperbolic Functions on Slide Rules and Civil Engineering Applications", Autumn 2001 issue of the "Slide Rule GAZETTE" (UK); and, from email pictures and information he furnished .  
R. H. - from information sent to me by Richard Smith Hughes about the slide rules in his collection.  
R. S. - Rodger Shepherd - from articles he sent to me on the Blanc and Pletts slide rules.  
S. T. - from scans and information sent to me by Steve Treadwell on the Lutz No. 300 B .  
SPHERE - Sphere Research, "Slide Rule Universe"- from pictures on their web site.  
WKR - from the Author's collection of slide rules. For corrections and additions to the listing email: wrobinson62@cox.net  
WKRM - from the Author's collection of instruction manuals.  
 
NOTE: ON THE SLIDE RULES DESIGNED BY F. BLANC AND J. ST. VINCENT PLETTS:  
My JOS article on hyperbolic slide rules was completed for printing a few weeks before the above listing was prepared to go on the JOS web site. In the interim period I was browsing through some past JOS Volumes and  
came upon an article that is of real interest. It is something that would have been nice to know ahead of time so that it could have been included in my JOS article. It is being reported here to complete the historical record.  
In JOS Vol. 4, No. 2, Rodger Shepherd presented a description of a slide rule designed in 1890 by F. Blanc. This slide rule was the first design to show a way to obtain the hyperbolic functions. In JOS Vol. 5, No. 1, further  
information on this slide rule was furnished in a letter submitted by Dr. Gunter Kugel. Although Blanc's slide rule did not have actual hyberbolic scales it did have marks on it whereby, when the conversion to base e was  
made, the values of Sinh and Cosh could be obtained. This slide rule is a major historical landmark in the history of hyperbolic rules, but unforunately no picture of it seems to exist. It seems Blanc submitted a Patent, but  
it was not issued and the slide rule was never manufactured. Peter Holland, in response to my questions for information, contacted Dr. Kugel, who said that he tried to construct the Blanc slide rule but was not successful.  
It seems the slide rule, if completed, would have been at least one and a half meters long. Also, a circular version may have been completed at the University of Frankfurt. Will continue efforts to obtain more information  
and a picture, if possible.  
After reading about the Blanc slide rule I contacted Rodger Shepherd, the author of the JOS Vol. 4, No. 2 article. He has been very helpful in sending me additional articles on the history of hyperbolic slide rules. One he sent  
me is copy of a paper from Vol. 33, Part 2, of the Proceedings of The Physical Society of London, dated February 15, 1921. The title of this paper was Some Slide Rule Improvements, by J. St. Vincent Pletts. This Article is  
important as it seems to be the first to show a picture of a slide rule with hyperbolic scales. It also predates Puchstein's patent application, dated May 12, 1921 (that resulted in the K&E 4093-3) by about three months. This  
proximity of dates appears to be just a coincidence as there is just no resemblance betwween the pictures of the scale layouts on the Pletts' and Puchstein's slide rules.  
Although Blanc's and Pletts' slide rule designs predated Puchstein's we need to keep in mind that the K&E 4093-3 was the first hyperbolic slide rule to be actually manufactured and sold to the public.  
 
NOTE: ON THE CHINESE SLIDE RULES WITH HYPERBOLIC SCALES:  
In the listing above there are duplicates because of the confusion of the different manufacturers names. Such as those under the names of CHINA SHANGHAI and SHANGHAI (China) that may not be manufacturers at all.  
There are many Chinese slide rules and I expect more will be found and added to the list as time goes by. Fortunately some of my confusion in how to list these has been lessened by Liu Qinglin, a slide rule collector and  
dealer, who lives in Beijing. He informed me that the SIDA company was formed in the 1930's. Then later in the 1960's united into the Shang Hai factory. He says slide rules listed as China Shanghai and Shanghai China  
are the same maker, and that Flying Fish and Ruyi are Trademarks.. Also, where the slide rule numbers are the same the scales are the same layout. For example, the Flying Fish 1015 slide rule is the same as the RUYI, SIDA,  
and Shanghai (SHANG HAI) rules with the same number of 1015. I know his comment to be true for some of the names, but as I only have a few of each of the various models for a cross-check it has not been verified.  
Also, this information only covers one manufacturer. What is the story about the other makers such as Ding Feng, Haiou Pai, Hangzhou, Hua Fang, Jang, Xuesh and unknown others? Who are they and where were they?  
If you know of Chinese slide rules that need to be added, or you see something on the list that needs correction, please send me the details. Pictures front and back and details of the guage marks on the scales and cursor.  
Since the above note was written an article on Chinese slide rules, written by Richard Smith Hughes and myself, has been published in the JOS Vol. 14, No 2; and a listing of the Chinese rules is on the JOS PLUS web site.  
The listing on the JOS Plus web site (of Chinese slide rules with hyperbolic scales (Vectors)) will be updated from time-to-time by Richard and myself as new information comes in.  
 
NOTE: ON DIETZGEN SLIDE RULES WITH HYPERBOLIC SCALES:  
JOS, Vol 5, No 2 has a number of articles on the history of The Dietzgen Company and its slide rules. This JOS Volume also contains a four page insert by Bruce Babcock. His Dietzgen Catalog Matrix lists the various  
slide rule model numbers and the years they were listed in the catalogs. From 1897 to 1972.  
 
NOTE: ON HEMMI SLIDE RULES WITH HYPERBOLIC SCALES:  
Details on Hemmi slide rules are listed in Paul Ross's article, A Comprehensive Hemmi Slide Rule Catalog, in JOS, Vol 12, No1, Spring 2003. I added a number of slide rules to my listing from his article.  
After World War II the Hemmi slide rule models that were produced were inscribed with the words, "Made In Occupied Japan". Also, some sold in the Phillipines had the word "ODELCO" inscribed on them.  
I checked a few rules that were inscribed with these extra labels against those that were not inscribed, and I could find no differences to report between the details on the same Hemmi model numbers.  
Information on the POST slide rules, that were made by Hemmi, was taken from the tables in the article by Paul Ross and Ted Hume, Slide Rules of the Frederick Post Company, in JOS, Vol 9, No 2, Fall 2000.  
 
NOTE: ON K&E SLIDE RULES WITH HYPERBOLIC SCALES:  
The initial source of the K&E slide rules that are listed was Michael O'leary's, Keuffel and Esser Slide Rule Master Cross Reference (K&E XREF) list that he emailed to me in July, 2002. An additional source was Clark  
McCoy's and Michael's web site showing dates and scans of many of the K&E Catalog pages. I checked the slide rules in my collection to these two sources, and added the gauge marks to the list. Richard Hughes wrote  
an Article, On the Evolution of K&E Vector Slide Rules, in JOS, Vol. 14, No.1, Spring 2005. He reviewed my list and I have made corrections from the comments and information he gave to me.  
 
NOTE: ON PICKETT AND ECKEL SLIDE RULES WITH HYPERBOLIC SCALES:  
In July 2002 Michael O'leary emailed me a listing he had of the various Pickett Model 4 slide rules. One year later, July 2003, he sent detailed photographs he had taken of many of the Model 4 Pickett slide rules. This  
comprehensive information from Michael was combined with the details shown on the Author's slide rules in order to complete the Pickett listing. Please review the listing of the Pickett and Eckel slide rules as I was  
confused in trying to sort out the different changes of Logos and Name descriptions on what appeared to be identical scale layouts. Some changes have been picked up but others may have been missed. For example,  
in the change to ES & T models the three cube root scales were retained, but two of the cube root scales were placed together, top and bottom on the same scale. So the three cube root scales were shown as two. The  
same for the two square root scales that were combined on top and bottom so that they were shown together on one scale. Also the eight N scales were all redesignated as LL scales. The eight LL scales (+ and - )  
were then combined into four scales so that they were shown together on one scale. Also, the eight N scales were all redesignated as LL scales. The eight LL scales (+ and - ) were then combined into four scales.  
After these changes, other modifications were the addition of a L scale, and then later a Ln scale was added. Other hard to follow changes were additions at times to the gauge marks on the scales. I wonder if all of the  
variations have been listed. Also, around 1949, it seems there was a move from Chicago to Alhambra, CA. Most rules seen said Chicago on them, but there was one with Alhambra. Did the scales on these differ?  
 
NOTE: ON RELAY / RICOH SLIDE RULES WITH HYPERBOLIC SCALES:  
Most of the following information has been taken from David Davis' "Relay / Ricoh Archive" web site. This is found under: www. geocities.com/usra482b/index.html. Relay/Ricoh produced some well made slide rules.  
The history of these slide rules started with the Nippon Slide Rule Company that distributed under the name "Nikkei". This Company later became San-ai, and adopted the "Relay" brand name. When the Company  
again changed names to San-ai Keiki Co. Ltd., the brand name became "Ricoh". The Relay/Ricoh slide rules were Rebranded, and the same slide rule layouts were sold under different Company names. Many of these  
Companies were in the United States. The Relay / Ricoh and the Rebranded slide rules with hyperbolic scales were as follows: Relay 157; Ricoh 157; Alvin 1157; Compass 1325; Lafayette F-686; Lafayette 99-7102;  
Lafayette 99-71029; Micronta 157; Scientific Instrument Company (SIC) 1570. More advanced slide rules with hyperbolic and special scales were: Relay 158; Relay DE-1008; Ricoh 158; SIC 1580, and Ricoh 159. The  
layout of the scales and other features of the slide rules following the above listed Relay 157, and Relay 158, are identical for practical purposes. The only exception, it seems, is the Ricoch 159. To my knowledge none  
of the other brands have a model 159. If someone knows of other 159 models, please let me know.  
 
 
                                   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 

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