Hemmi Slide Rule Catalogue Raisonn
This Catalogue Raisonne describes every slide rule ever made by the Hemmi Slide Rule Company of Japan--or at least all those I have been able to identify. It is the most comprehensive catalogue of Hemmi slide rules ever published. There are two parts: (1) THIS PAGE lists Hemmi slide rules for which a model number is known.
(2) The SECOND PAGE (click here) contains descriptions of Hemmi-made slide rules for which I have not been able to determine a model number. These are usually rules with names rather than numbers or military rules or rules sold under another company's (Post, Foxboro, SKF, etc.) name.
Construction material is celluloid on bamboo except for model number which begin with "P" (e.g., "P23") which are all plastic and for a few rules whose substance is explicitly mentioned in the text.
This is an updated version of the Comprehensive Hemmi Catalog which was published in the Spring 2003 issue of the Journal of the Oughtred Society. It is based upon about 500 documents, photographs and specimen slide rules, many of which were supplied by my friends in Japan: William Lise, Atsushi Tomozawa, Yukio Kubota and Hitoshi Nori; I cannot begin to express my gratitude to them. Many errors exist in spite of their efforts and this catalog remains a work in progress. I will be grateful to anyone who can supply missing information or pictures or point out errors. I am indebted to Tom Dilatush for prolonged discussions of how this information should be organized and displayed.
Paul Ross
Model Dates   Front Scales Rear and Other Calculating Scales Body Comment Also Sold As
Models1-18: Obsolete model numbers abandoned about 1930.
1
1/1
1913-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
250 x 28 x 9.5mm
Mannheim. ("Normal") Discontinued as a Hemmi rule ca1930 but made until WWII for Post. Tamaya 1941 (1916-27);
H-O 1768 (-1914-);
Post 1449 (1930-WWII)
  Pic Artillery variant with minutes and mils conversion scales on bottom edge and trigonometric formulas for gunnery on back of rule. Dates probably later than model 1.
  Pic A [B, Stadia, C] D Stadia variant. Stadia scale (SinCos and Cos) added to front of slide. Dates probably later than model 1.
2 1913-29 Pic Same as model 1 but with decimal-indicating cursor. Tamaya 1937 (1913-27); H-O 1767 (-1914-28-)
3 1919-29 Pic LL2, A [B, C] D, LL3 [S, L, T] (S keyed to A/B)
Gutter: E, F
//Closed||
250 mm x 1-1/4in x 10 mm
Electro. (Copy of Faber 378) LL scales keyed to offset W gauge mark. E,F scales separated in gutter. No over-range. HP gauge mark (probably only 746). Single hairline. At least three different cursors. Tamaya 1905 (1919-27); Hemmi 80 (1930+).
4 1919-29 Pic Same as 3 but with decimal-indicating cursor. Tamaya 1904 (1916-27), Hemmi 81 (1930+).
5 1919-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
500 mm x 1-1/4 x13/32in
Discontinued as a Hemmi rule ca1930 but made until WWII for Post. Tamaya 1899 (1916-27);
H-O 1772 (1928);
Post 1450 (1936-WWII).
6 1914-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
125 x 24 x 9 mm
Pocket Mannheim. Replaced by model 48 ca1930. H-O 1763 (-1914-35);
Tamaya 1942 (1916-27).
7 1926-29 Pic Same as 6 but with decimal-indicating cursor   Tamaya 1949 (1927)
8 1913-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
125 x 24 x 9 mm
Extra Fine Mannheim w Magnifier. Tamaya 1943 (1916-27);
H-O 1764 (-1914-48-)
9 1919-29 Pic Same as 8 but with magnifiying decimal-indicating cursor Discontinued ca1930. Tamaya 1900 (1916-27)
10 1926-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
250 mm
Ten-inch extra fine with "extended lens" magnifier. Discontinued ca1930. Tamaya 2148 (1927)
11 1926-29 Pic Same as model 10 but with decimal-indicating "extended-lens" magnifying cursor. Discontinued ca1930. Tamaya 2180 (1927)
12 1926-29   DF [CF, CI, C] D (Folded at ?) Blank ?
150 mm
Simplified Slide Rule. Plastic.
Single uncorroborated reference.
 
12 1926-29 Pic Same as model 3 but with "extended-lens" magnifying cursor. Discontinued ca1930. Tamaya 2782 (1927)
13 1926-29 Pic Same as model 4 but with decimal-indicating "extended-lens" magnifying cursor. Discontinued ca1930. Tamaya 2783 (1927)
14 1926-29 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
100 mm x 11/16 x 7/32 in
Vest Pocket Mannheim. Tamaya 2784 (1927);
Hemmi 30 (1930+)
15 1926-29 Pic Same as 14 but with decimal-indicating cursor. Tamaya 2785 (1927); Hemmi 31
16 1926-29 Pic Same as 14 but with magnifying cursor. Tamaya 2786. Hemmi model number changed to 32 in 1930.  
17 1926-29 Pic Same as 14 but with magnifying decimal-indicating cursor. Tamaya 2787. Hemmi model number changed to 33 in 1930.  
18 1926-28   Pocket kit including pen, pad and model 15 slide rule. Tamaya 2788, Discontinued ca1928.
Model Numbers 20-24 were assigned to Classroom Demo Rules before WWII; Student Rules after WWII.
20 1932-37   A [B, CI, C] D, K [S, L, T] (S keyed to A/B) Demo
2000 mm
Demonstration Mannheim (Model 50). Tamaya 4451 (1932)
21 1932-37   K, A [B, CI, C] D, L with over-range [S, S&T, T] Demo
2000 mm
Demonstration Rietz (Model 64). Tamaya 4452 (1932)
22 1954-59 Pic [CI, C] D, A No back Special
200 x 23 x 9 mm
Cheap student rule distributed in Asia only. Slide held to single stator. Sandalwood (not bamboo) with celluloid cursor.
P23 1958-59 Pic A [B, CI, C] D Blank Open
180 mm x1 x1/8in
Student Mannheim w CI scale.  
P24 1963 Pic DF [CF, CI, C] D, A Folded at √10. Blank Open
180 mm x1 x1/8in
Student.  
24 1927 Pic A [B, C] D Blank //Closed||
125 x 26 x 3 mm
Ultra-thin all plastic with celluloid cursor. 13 cm scale on top edge; bottom blank. Identical to model 34 except imprinted with advertising. Rare. Appears in no known catalog.
Models 30-39: Miscellaneous four- and five-inch closed body rules
30 1930- WWII
See below
Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
100 mm x 11/16 x 7/32 in
Vest Pocket Mannheim. Model number never appears on rule. Some w "SUN" cut through or "SKF" embossed into backing plate. Hemmi 14; Tamaya 4453 (1927); Post 1447 (1931-33); 1440 (1934-WWII)
31 1930-39 Pic Same as 30 but with decimal-indicating cursor. No CI scale. Hemmi 15; Tamaya 4454
32 1930-WWII Pic Same as 30 but with magnifying cursor. Same as Hemmi 16; Tamaya 4455; Post 1447M (1931-33); 1441 (1934-WWII); Boston Blue Print 1441; US Blue 1888
33 1930-39 Pic Same as 30 but with decimal-indicating magnifying cursor No CI scale. Hemmi 17; Tamaya 4456
30R 1949-50 Pic A [B, CI, C] D [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
100 mm x 11/16 x 7/32 in
Vest Pocket Mannheim w CI scale. No model number on rule but case and box marked "30R." Fuji 41.
30 1951+ Pic Same rule with "R" dropped from model number on case and box. All-plastic cursor after ca 1970.  
32R 1949-50 Pic A [B, CI, C] D [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
100 mm x 11/16 x 7/32 in
Same body as 30R except with magnifier. No model number on rule but case and box marked "32R." Post 1441(WWII-1971);
T-P 44DA-410 (1972+);
H-O 1760 (-1952-64);
Geo 341-3405 (1964+)
US Blue 1888 (MIOJ)
32 1951+ Pic Same rule with "R" dropped from model number on case and box. All-plastic cursor after ca 1970.
P33S 1970-71 Pic A [B, CI, C] D, K [S, L, T] (S keyed to C/D) Closed
125 x 28 x 5 mm
Pocket Improved Mannheim. All-plastic version of model 34RK.  
P33/SS 1970+ Pic A [B, CI, C] D, K [S, L, T] (S keyed to C/D) Closed
125 x 27 x 4.5mm
Pocket Improved Mannheim. Unique size.  
34 1932- Pic A [B, C] D Blank //Closed||
125 x 26 x 3 mm
Ultra-thin all plastic with celluloid cursor. 13 cm scale on top edge; bottom blank. Hemmi 24; Tamaya 4457
34P 1932-40   A [B, C] D Blank //Closed||
125mm x 15/16 x 5/32in
Thin Pocket Mannheim with blank back Post 1443 (1931-WWII)
1940-50 Pic //Closed||
125 x 26 x 5 mm
 
34π 1932-40   CF [DF, CI, C] D [S, L, T] (S keyed to C/D) //Closed||
125mm x 15/16 x 5/32 in
Thin Pocket Mannheim with folded scales Post 1445 (1931-WWII)
1940-50 Pic //Closed||
125 x 26 x 5 mm
 
34R 1935-40 Pic A [B, CI, C] D [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
125mm x 15/16 x 1/8 in
Thin Pocket Mannheim w CI Scale. Post 1444 (c1935-WWII);
H-O 1762 (-1935-WWII)
1955-67 Pic //Closed||
125 x 26 x 5 mm
 
34RK 1936 + Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
125 x 26 x 5 mm
Post 1444K (1937-70),1444(1971); T-P 44DA-440 (1972+);
US Blue 1887 (1930s); H-O 1762 (WWII-64); Geo 341-3425 (1964+).
34T 1936-39 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
125 mm x 15/16 x 1/8 in
Thin Pocket Mannheim. "SUN" or ASEA embossed into backing plate.  
35 1935- 48 Pic A [B, C] D [S, L, T] (S keyed to A/B) ||Closed||
100 mm x 11/16 x 3/16 in
Vest Pocket Mannheim with 4-inch and 10-cm measuring scales on square edges Post 1437 (c1935-WWII);
H-O 1761 (-1935-48-)
35ML 1930s Pic Same as 35 but with magnifying cursor  
P35 1961 Pic K, DF [CF, CI, C] D, A Folded at √10. Blank Open
115 mm x 1 x 1/8in
Thin bamboo core (in spite of "P" prefix) coverd with PVC (not celluloid). Marks printed, not engraved as usual with celluloid over bamboo rules. Hughes-Owens (catalog number illegible on specimen)
P35S 1971 Pic K, DF [CF, CI, C] D, A Folded at √10. [LL1, LL2, LL3] Closed
125 x 28 x 4.6mm
   
36 1936-WWII Pic A [B, CI, C] D [S, L, T] (S keyed to A/B) Closed
125 mm x 3/4 x 7/32 in
Narrow Pocket Mannheim w CI scale. Measuring scales on BACK of rule. Post 1438 (c1935-WWII)
P36
P36S
1966-70 Pic D [Conversion gauge marks, A] D Instructions [Conversion gauge marks, B] Instructions Open
115 mm x 1 x 1/8in
Rule is labeled "P36;" box and instructions "P36S." Set arrow on slide opposite value on top D scale; converted value appears on bottom D scale opposite corresponding arrow. Reverse slide for more conversions. Markings and instructions in Japanese.
P37 1968-69 Pic (1), (2), D [C, CI, B] MD1, MD2 [B, PR1, PR2, PR3] Closed
125 x 28 x 4.6mm
SALES. Labeled in Japanese. MD1 is months and days from 1/1 to 6/30, MD2 from 7/1 to 12/31. PR1-2-3 = three short profit ratio scales. Slide must be reversed to read. {Two hairlines: D: 1.2}.
P39 ?   K, A, DF [CF, CIF, CI, C] D, DI, L (Folded at ?) [B, TI, SI, C] Closed
125 mm
   
Models 40-49: Basic Mannheim Rules (A [B, C] D) before WWI and "Improved" Mannheim (A [B, CI, C] D, K) after WWII.
40 1932-49 Pic A [B, C] D [S, L, T] (S keyed to A/B) Closed
250 x 28 x 8 mm
Tamaya 4458 (1927), Post 1446 (1931-49); H-O 1768 (-1935-48-); Boston Blue Print 1446; US Blue 1876 (1930s); Lietz 2974N (1930s).
41 1932-39 Pic A [B, C] D [S, L, T] (S keyed to A/B) Closed
125 mm
Pocket Mannheim. No measuring scales Tamaya 4459 (1932)
42 1932 Pic A [B, C] D [S, L, T] (S keyed to A/B) Closed
250 x 28 x 8 mm
Model 40 w measuring scales on BACK. Tamaya 4460 (1932)
43 1932   Same as 42 but with decimal-indicating cursor. Tamaya 4461 (1932)
44 1932 Pic A [B, C] D [S, L, T] (S keyed to A/B) Closed
125 mm x 15/16 x 1/4in
No slant; cm & inch scales on back of rule. Tamaya 4462 (1932)
45 1932   Same as 44 but with decimal-indicating cursor. Tamaya 4463 (1932)
45 1951-68 Pic DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Closed
200 x 28 x 8 mm
Student. Quite different from 1932 model 45.  
46 1936-40   A [B, C] D ? Special
125mm x 1 in
"Cardboard covered in transparent celluloid with leather sheath."  
47 1936-WWII Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
250x28 x 8 mm
Thin successor to model 1/1. Post 1449T (1937-WWII)
48 1932-40 Pic A [B, C] D [S, L, T] (S keyed to A/B) //Closed||
125 mm x 15/16 x 1/4 in
Pocket Mannheim. Thin successor to model 6.  
40F 1968 Pic K, DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Closed
250 x 28 x 8 mm
  Fuji 85.
40RK 1949-72 Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B) Closed
250 x 28 x 8 mm
Improved Mannheim. ("Slide Rule with CI and K Scale" in early lit) Post 1447 (c1949-1971);
H-O 1768C (-1952-64);
Geo 341-3526 (1964-71);
US Blue 1877 (1940s?)
1973+ Pic Same as preceding but wider with thick plastic back Closed
250 mm x 1-1/4 x 9/32 in
T-P 44BA-470 (1972+);
H-O 341-3526 (1972+)
P
40RK
1967-59 Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B) Open
250 x 28 x 8 mm
All-Plastic Improved Mannheim. Hard plastic case. Post 1447P (c1967);
Geo 341-3530 (c1967)
43A 1961 Pic A [B, CI, C] D, K [T, L, S] (S keyed to C/D) Closed
200 x 28 x 8 mm
Student Improved Mannheim.  
P43D 1973 Pic A [B, CI, C] D, K [T, L, S] (S keyed to C/D) Closed
200 x 28 x 6.4mm
Like 43S except no indices on back of rule; slide must be reversed.  
P43S 1969 Pic A [B, CI, C] D, K [T, L, S] (S keyed to C/D) Closed
200 x 28 x 6.4mm
Plastic version of 43A. Indices for reading trig scales on back of rule.  
45K 1962+ Pic K, DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Closed
200 x 28 x 8 mm
Post 1445 (c1966-71); T-P 44BA-450 (1972+); Geo 341-3500 (1967+). All have scales folded at π.
P45K 1965-68 Pic K, DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Open
200 x 28 x 5 mm
Open body all-plastic version of 45K Post 1445P (-1965-) has scales folded at π.
P45D 1973 Pic K, DF [CF, CI, C] D, A Folded at √10. [T, L, S] Closed
200 x 28 x 6.4mm
"Junior High School Students." Like P45S except trig scales not inverted and no indices on back of rule; slide must be reversed.
P45S 1968+ Pic K, DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Closed
200 x 28 x 6.4mm
Closed body all-plastic version of 45K. Simpler construction than P45K.  
Models 50-59: "Improved" Mannheims (A [B, CI, C] D, K and [S, L, T]) and variants
50
50/1
50/3
1932-51 Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
250 x 28 x10.5mm
Improved Mannheim. Formerly model 102. Hemmi 102; Tamaya 4464 (1932); Post 1452 (c1935-51); H-O 1771 (-1928-48-); US Blue 1880 (1930s)
50F, 50/1F 1936-48 Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B) //Closed||
250 x 28 x 8 mm
Thin version of 50, 50/1 but accepts standard cursor. Post 1452T (1936-WWII)
50/1π 1936-WWII Pic A, DF [CF, CI, C] D, L Folded at π. [S, S&T, T] //Closed||
250 x 28 x10.5mm
  Post 1455 (c1935-WWII)
50W 1951+ Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B except WWII-1955 keyed to C/D) //Closed||
250 x 34 x 11 mm
Wide Improved Mannheim. Post 1452W ('51-70), 1452 ('71); T-P 44BA-520 ('72+);
H-O 1771 ('51-64);
Geo 341-3215 ('64+)
P50 >1956   A [B, CI, C] D, K Blank Open?
250 mm x 1-1/2 in
Improved Mannheim  
50-20 1935-WWII Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B) //Closed||
500 x 34 x 11 mm
Long Improved Mannheim. Made for Post & H-O only; not sold as Hemmi brand. Post 1454 (-1936-WWII);
H-O 1772 (-1935-58-)
H-O 341-3235 (-1969-)
WWII-1969 Pic //Closed||
500 x 40 x 12 mm
Wide Long Improved Mannheim. Hemmi & Post brands. {Three Hairlines: D: C, C}.
51/1, 51/3 1932-39 Pic Same as 50/1, 50/3 but with decimal-indicating cursor. //Closed||
250 x 28 x10.5mm
Formerly model 103. Tamaya 4466, 4467 (1932)
52 1932-WWII Pic A [B, CI, C] D [S, L, T] (S keyed to A/B) //Closed||
125 mm x 15/16 x 11/32in
Thicker than 34R Tamaya 4468; Post 1448 (1936-37)
53 1932-39 Pic Same as 52 but with decimal-indicating cursor. Tamaya 4469 (1932)
54 1936-WWII Pic A [B, CI, C] D, K with over-range [S, L, T] (S keyed to A/B) //Closed||
150 x 26 x 6 mm
Extra Fine Improved Mannheim with magnifying cursor. Post 1453 (c1935-WWII)
55 1936-39   Same as 54 but without magnifying cursor    
Models 60-79: Rietz Rules ( K, A [B, C] D, L and [S, S&T, T] )
60/1, 60/3 1930-37 Pic K, A [B, C] D, L [S, S&T, T] //Closed||
250 mm x 1-1/4 x 13/32in
Rietz. Single line model 60/1 discontinued ca 1930. Tamaya 4470, 4471 (1932)
1937-39 Pic K, A [B, C] D, L with over-range
61/3 1932-39   Same as 60/3 but with decimal-indicating cursor.
62/3 1932-39   K, A [B, C] D, L [S, S&T, T] //Closed||
150 mm
Extra Fine Rietz. Tamaya 4472, 4473 (1932)
63/3 1932-39   Same as 62/3 but with decimal-indicating cursor.
64, 64/1, 64/3 1932-67 Pic K, A [B, CI, C] D, L with over-range [S, S&T, T] //Closed||
250 x 34 x 11 mm
"System Rietz." {64/3 hairlines: D: C, C} Some w 13-0-13 cm on bottom. Probably without over-range before 1935. Tamaya 4474 (1932)
64T 1965-71 Pic K, A [B, BI, CI, C] D, DI, L with over-range [T2, T1, ST, S] //Closed||
250 x 34 x 11 mm
Super Rietz. {3 hairlines: D: C, C}.  
65 1932-39 Pic Same as 64/3 but with decimal-indicating cursor. //Closed||
250 x 34 x 11 mm
  Tamaya 4475 (1932)
66 1932-67 Pic K, A [B, CI, C] D, L with over-range [S, S&T, T] //Closed||
150 x 26 x 9 mm
Extra Fine Improved Rietz. {3-line cursor: D: C, C} Some 8-0-8 cm on bottom. Tamaya 4476 (1932)
66F 1936-40 Pic Same as 66 but thin.    
67 1932-39   Same as 66 but with 3-line magnifying cursor.   Tamaya 4477 (1932)
68 1932-39   Same as 66 but with 3-line decimal-indicating cursor.   Tamaya 4478 (1932)
69 1932-39   Same as 66 but with 3-line decimal-indicating magnifying cursor.   Tamaya 4479 (1932)
70 1932-40 Pic K, A [B, CI, C] D, L with over-range [S, S&T, T] //Closed||
500 x 34 x 12 mm
Long Improved Rietz. {3 hairlines: D: C, C}. Tamaya 4480 (1932)
1951-67 Pic //Closed||
500 x 40 x 12 mm
72 1966-71 Pic K, DF [CF, CIF, CI, C] D, A with over-range Folded at √10 [TI2, TI1, L, SI] //Closed||
500 x 40 x _ mm
"Precision Slide Rule for Practical Engineers." Single hairline.  
74 1937-71 Pic K. A [B. CI. C] D, L with over-range [S, S&T, T] //Closed||
125 x 26 x 5 mm
Pocket Improved Rietz. {3 hairlines: D: C, C}.  
Models 80-89: "Electro" Slide Rules
80
80/1
80/3
-1932   LL2, A [B, C] D, LL3 No over-range [S, L, T] (S Keyed to A/B)
Gutter: E, F
//Closed||
250 x 34 x 11 mm

(wider than
model 3)
Electro. LL scales keyed to offset W gauge mark. E,F scales separated in gutter. No over-range. Hp gauge mark Hemmi 3;
Tamaya 4481, 4482 (1932);
H-O 1770 (-1928-c50);
Post 1456 (c1934-WWII)
1932-33 Pic LL2, A [B, CI, C] D, LL3 No over-range Like preceding except CI scale added.
1934-36   [S, L, T] (S Keyed to A/B)
Gutter E, F
Like preceding except no W mark, E, F scales close together in gutter.
1936-52 Pic LL2, A [B, CI, C] D, LL3 with over-range Like preceding with over-range scales.
81/1, 81/3 1928-39 Pic Same as 80/1, 80/3 (4 variants--depending upon date mfd) but with decimal-indicating cursor. //Closed||
250 x 34 x 11 mm
  Hemmi 4;
Tamaya 4482, 4484 (1932)
82 1932-37   Same as 80/1 except short. //Closed||
125 mm x _
  Tamaya 4485 (1932)
83 1932-36   Same as 82 but with decimal-indicating cursor. Tamaya 4486 (1932)
84 1932   Same as 82 but with magnifying cursor. Tamaya 4487 (1932)
85 1932 Pic Same as 82 but with magnifying decimal-indicating cursor Tamaya 4488 (1932)
85 1946? Pic db, Neper, A [B, CI, C] D [TI2, TI1, L, SI1] //Closed||
250 x 34 x 11 mm
{3 hairlines: A: C2, 1.307} (Why 1.307?) Not electro, therefore model number 85 is inappropriate. Rare.
80K 1953-70 Pic E, F, A [B, CI, C] D, LL2, LL3 with over-range [S, L, T] (S keyed to A/B)
Bottom Edge: K
//Closed||
250 x 34 x 11 mm
Electro. K scale on bottom edge; no scales in gutter. No hp mark but different cursors avail for British/US and French/Metrc HP. {3-line cursor: A: hp, C2}.
86/3 1936-40   LL2, A [B, CI, C] D, LL3 with over-range [S, L, T] (S keyed to A/B)
Gutter: E, F
//Closed||
150 x 26 mm
Extra fine Electro. Hp gauge mark. No W mark. E,F scales close together in gutter. {Three hairlines: A: hp, C2}.  
86/3K 1950-51 Pic LL2, A [B, CI, C] D, LL3
with over-range
[S, L, T] (S keyed to A/B)
Gutter: E, F
Bottom Edge: K
//Closed||
150 x 26 x 8 mm
Same as model 86/3 except K scale added to bottom edge.  
86 Identical to and contemporaneous with model 86/3K.  
86K 1954-70 Pic E, F, A [B, CI, C] D, LL2, LL3 with over-range [S, L, T] (S keyed to A/B)
Bottom Edge: K
//Closed||
150 x 26 x 8 mm
Extra Fine Electro. No scales in gutter, no hp mark. {Three hairlines: A: hp, C2}.  
87/3 1936-39   Same as 86/3 but with magnifying cursor. //Closed||
150 x 26 mm
   
Models 90-99: Stadia Slide Rules
90 1932-39 Pic L, D [M1, M2, C] D, A with over-range [S, S&T, T]
Bottom Edge: K, IA
//Closed||
250 x 34 x _ mm
Stadia. {3 hairlines: D: C, C}. Two calculating scales on bottom edge. IA scale read from offset pointer keyed to rightmost hairline.
90A 1940   Same as 90
90B 1939? Pic Same as 90 but using "centesimal degrees."
(100 centesimal degrees = right angle)
First of a proposed series (models 90B, 91B, 2690B) of centesimal-degree stadia rules. Models 91B and 2690B never manufactured.
91 1932-39 Pic Same as 90 but with decimal-indicating cursor //Closed||
250 x 34 x _ mm
  Tamaya 4490 (1932)
91A 1939?   Same as 91. "91A" used to distinguish this rule from proposed centesimal degree model 91B.
92 1932-39 Pic L, D [M1, M2, C] D, A [S, S&T, T]
Bottom Edge: K, IA
//Closed||
150 x 26 x 9.6mm
Extra Fine Stadia. Two calculating scales on bottom edge. {3 hairlines: D: C, C}. Tamaya 4491 (1932)
93 1932-39 Pic Same as 92 but with magnifying cursor. Tamaya 4492 (1932)
94 1932-39   Same as 92 but with decimal-indicating cursor. Tamaya 4493 (1932)
95 1932-39   Same as 92 but with decimal-indicating magnifying cursor. Tamaya 4494 (1932)
96 1936-39 Pic L, D [M1, M2, C] D, A with over-range [S, S&T, T]
Bottom Edge: K, IA
//Closed||
500 x 34 x 11 mm
Long 90. {3 hairlines: D: C, C}. Two calculating scales on bottom edge. IA scale read from offset pointer keyed to center hairline.
Model Numbers 100-107 were assigned to new rules developed in 1926-27; replaced by modern numbering system about 1930.
100 1926-27 Pic A [B, CI, C] D [S, L, T] (S keyed to A/B) //Closed||
250 mm
Short lived. Tamaya 2790 (1927)
101 1926-27 Pic Same as 100 but with decimal indicating cursor. Tamaya 2791 (1927)
100 1932 Pic A [B [CI, CIF] C] D
CI and CIF scales are on a slide within the usual slide.
? //Closed||
250 mm
"Haraguchi's Duplex Slide Rule" ("Duplex" meant a second slide within the usual slide. Hemmi's true duplex rules were called "Universal" at this time.) Tamaya 4496 (1932)
102 1926-28 Pic A [B, CI, C] D, K [S, L, T] (S keyed to A/B) //Closed||
250 x 28 mm
Improved Mannheim. Model number changed to 50/1 ca 1928. Tamaya 2792 (1927),
H-O-1771
103 1926-27 Pic Same as 102 but with decimal-indicating cursor. Model number changed to 51/1 ca 1928. Tamaya 2793, (1927)
104 1927   LL2, A [B, CI, C] D, LL3 No over-range [S, L, T] (S keyed to A/B)
Gutter: E, F
//Closed||
125 mm
Pocket Electro. LL scales keyed to offset W gauge mark. E,F scales separated in gutter. No over-range. Hp gauge mark. Hemmi 82;
Tamaya 2994 (1927)
105 1927   Same as 104 but with decimal-indicating cursor.   Hemmi 83, Tamaya 2995
106 1927   Same as 104 but with magnifying cursor.   Hemmi 84, Tamaya 2996
107 1927   Same as 104 but with magnifying decimal-indicating cursor.   Hemmi 85, Tamaya 2997
Models 100-109: Large Classroom Demonstration Rules
100 1954-67 Pic DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Demo
1000 mm
Demonstration version of model 45.  
100K 1971?   K, DF [CF,CI, C] D, A Folded at √10. [TI, L, SI] Demo
1000 mm
Demonstration version of model 45K  
101 1954-56   l, A [B, CI, C] D [S, K, T] (S keyed to C/D) Demo
1000 mm
Demonstration version of model 2640.  
101A 1967-75 Pic A [B, CI, C] D, K [S, L, T] (S keyed to C/D) Demo
1000 mm
Demonstration version of models 40RK & 43A.  
102 1954-67   CI, C, [D, A] Blank Demo
1000 mm
Demonstration version of model 22.  
103 1959-67   K, DF [CF, CIF, CI, C] D, A Folded at √10. [TI1, TI2, L, SI] Demo
1500 mm
Demonstration version of model 2664S.  
104 1959       Demo
1000 mm
Demonstration  
107 1971?   LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1 Folded at √10. K, A [B, TI1, TI2, SI] D, DI Demo
1000 mm
Demonstration version of model P253.  
108 1971?   LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at√10 K, A [B, TI, SI, C] D, DI, L Demo
1000 mm
Demonstration version of model 254W.  
Models 110-129: Reserved for Specialty Rules but Hardly Used
110 1937-40 Pic LL2, A [B, CI, C] D, LL3 with over-range [S, S&T, T]
Bottom Edge: K
//Closed||
250 x 34 x 11 mm
Mechanical/ Electrical. K scale on bottom edge. {Three hairlines: D: C, C}.  
120 1939 Pic L, K, A [B, CI, S1, T1, C] D,SΘ
with over-range
[LL3, LL3, LL2, LL2, LL1, LL1]
Bottom Edge: GΘ
(2 scales)
//Closed||
250 x 34 x 11 mm
"MIGHT." Listed without description by Katsunori Kadokura (Chronology of Japanese Hemmi Slide Rules, Journal of the Oughtred Soc, Vol 1, No 2, August 1992). Pictured specimen identified as Model 120 by Yukio Kubota, March 2014.
DP121 1969       Projectn 305X182 X 12 mm Described in manual for DP122 (below) as projection rule for model P253.  
DP122 1969 Pic K, A, DF [CF, CIF, CI] D, DI, L K, A, DF [B, CTI2, TI1, SI, C] D, DI, L Projectn 305X182 X 12 mm Overhead projection rule for models 2662 and 2664S. Sold with five masks for obscuring irrelevant scales.  
Models 130-139: Darmstadt (L, K, A [B, CI, C] D, Cos, Sin, Tg and [LL1, LL2, LL3]) and Variants
130 1951-67 Pic L, K, A [B, CI, C] D, Cos with over-range [LL1, LL2, LL3]
Bottom Edge: SIN tg
//Closed||
250 x 34 x 11 mm
Darmstadt. S and T scales on bottom edge of rule.
{3 hairlines: D: hp-C, C}.
 
130W 1970-72 Pic T, K, A [B, BI, CI, C] D, P, S with over-range [L, LL0, LL1, LL2, LL3] //Closed||
250 mm x 1-1/2 x 7/16 in
Advanced Darmstadt. Unique width.
{3 hairlines: A: C2, hp-C2}.
 
135 1959-71 Pic T, K, A [B, CI, C] D, P, S with over-range [L, LL1, LL2, LL3] //Closed||
125 x 26 x 5 mm
Pocket Darmstadt.
{3 hairlines: D: hp-C, C}.
 
P135k 2005 Pic T, K, A [B, CI, C] D, P, S with over-range [L, LL1, LL2, LL3] Closed
200 x 32 x 4.3mm
Darmstadt. Only 250 made. Manufactured in 2005 to specs of ISRG and Japanese collectors and sold by subscription.
136 1951-67 Pic L, K, A [B, CI, C] D Cos with over-range [LL1, LL2, LL3]
Bottom Edge: SIN tg
//Closed||
150 x 26 x 8 mm
Extra Fine Darmstadt. D scale is labeled "SIN" other scales not labeled.  
Models 140-149: Pocket Duplexes
140 MIOJ Pic DF [CF, CI, C] D, L Folded at √10. A [B, TI, SI, C] D, DI Duplex
150 mm x 1-3/16 x 1/4 in
Hemmi's first "pocket" duplex. Body is short version of old narrow model 150.
P141 1969-72 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π T, S, U, P [Q, c, V, R] A q, n, L Duplex
125 x 34 x 4 mm
Toyo Carrier Corp for air conditioning duct design. Marked "'Carrier' Ductuler." Solid plastic stators but same size and cursor as bamboo 149A.
143 1968 Pic P1, P2, DF [CF, CIF, CI, C] D, LL (2 scales. One has second calibration for %) Folded at 3.6 A, N [M, , S/d, C] D, G Duplex
125 x 34 x 4 mm
"Commerce." N, M have 365 division for dates. , S/d = pound, shilling/pence. G is a set of conversion gauge marks. Pocket version of Hemmi model P263.
149 1958- Pic LL/1. LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. L, K, A [B, TI, SI, C] D, LL0, LL/0 Duplex
125 x 34 x 4 mm
"Pocket 259D" but actually closer to 259 with TI, SI instead of T, S, ST. Hemmi name on back of rule. Bare bamboo edges.
149A 1966+ Pic Same as 149 except celluloid veneer covers edges.
P149A 1970s? Pic LL/1. LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π L, K, A [B, TI, SI, C] D, LL0, LL/0 Duplex
125 x 36 x 4 mm
All plastic. About 10 mm longer overall and 2 mm wider than bamboo 149A.  
Models 150-300: Ten- and Twenty-Inch Duplex and Open Body Rules
150 1929-WWII Pic DF [CF, CIF, C] D Folded at π. K, A [B, S, T, CI] D, L Duplex
250 mm x 1-3/16 x 1/4 in
Hemmi's first duplex. Copied from K&E 4088-3. Same narrow width as K&E. Tamaya 4497 (1932); Post 1458 (c1931-WWII); H-O 1765 (-1935-WWII); US Blue 1881 (1930s): Lietz 3054L (1930s)
WWII-48 Pic Duplex
250 mm x 1-5/8 x 1/4 in
Standard width. Replaced by model 250. H-O 1765 (WWII-c49)
152 1929-48 Pic K, A [B, CI, C] D, T Θ, Rθ, P [Q, Q', C] LL3, LL2, LL1 Duplex
250 mm x 1-5/8 x 1/4 in
Electrical Engineer's Universal Duplex. Often no model number. Some marked "US Pat 1459857." (Issued to O D Parsons in 1923 for P, Q scales.) Tamaya 4498 (1932); Post 1459 (c1933-WWII); H-O 1766 (-1935-48-); US Blue 1889 (1930s) Lietz (1930s)
153 1933-67 Pic L, K, A [B, CI, C] D, T Gθ Θ, Rθ P, [Q, Q', C] LL3, LL2, LL1 Duplex
250 mm x 1-5/8 x 1/4 in
Electrical Engineer's Universal Duplex. Some (c1938) with stator screws on back of rule. US Patent 2079464, May 4, 1937. Post 1461 (c1933-WWII);
US Blue 1893 (1030s)
154 1929-67 Pic DF, P', P [Q, CF, CI, Sθo] A, D, K Folded at π. Sχ, Tχ, Tθ [Th, Sh, Sh C] D, L, χ Duplex
500 mm x 1-3/4 x 1/4 in
Electrical Engineer's Universal 20" Duplex. Two cursors. Early has scale letters eteched on cursor glasses. Tamaya 4499 (1932);
Post 1460 (c1933-WWII)
155 WWII-1950 Pic K, A, DF [CF, B, CI, C] D, L Folded at √10. Sh1, Sh2, Th1 [TI2, TI1, SI1, C] D, DI Duplex
250 mm x 1-5/8 x 1/4 in
General Engineering with Hyperbolic Scales. Replaced by model 255.  
157 WWII-1950 Pic K, A, DF [CF, B, CI, C] D, L Folded at √10. LL/1, LL/2, LL/3 [TI2, TI1, SI1, C] LL3, LL2, LL1 Duplex
250 mm x 1-5/8 x 1/4 in
General Engineering with Log-Log Scales.  
159 1949-51 Pic T, DF [CF, CIF, CI, C] D, S, ST Folded at π. LL0, LL00, A [B, K, L, C] LL3, LL2, LL1 Duplex
250 mm x 1-5/8 x 1/4 in
Replaced by model 259 c1951. Post 1462H (c1949 -51) Post 1462H was replaced by Versalog (Hemmi 258)
160 1951 Pic Nomogram1(α=0.05), χ2, A [B, CI, C] D, φ, ax P, F'1 [F'2, a'] A, χ2, ,Nomogram2(α=0.01) Duplex
250 mm x72.5mm
Inductive Statistics. Almost three inches wide!. Stator with nomograms is about 46 mm wide. All-plastic cursor similar to Relay/Ricoh.
165 1953       Duplex
250 mm x _
Statistical Sampling. No slide, just many short scales and a cursor.  
190 1939-40 Pic K, A [B, R2, R1, C] D, DI [SI2, SCI2, SI1, SCI1]
Bottom Edge: L
Closed
250 x 40 x 11 mm
"Precision Stadia" {3 hairlines: D: C, C}.
Left half of SCI1 scale is inverse cos2.
 
200 1937-67 Pic D6, D5, D4 [C6, C5, C4, C3, C2, C1] D3, D2, D1 DF6, DF5, DF4 [CF6, CF5, CF4, CF3, CF2, CF1] DF3, DF2, DF1 Scales folded at 12√10. Duplex
400 mm x 1-3/4 x 1/4 in
Precision Duplex. (Originally known as "Ultra accuracy.") Four digit precision. Scales are cut into six segments, each 400 mm long. Early production has scale labels in green on cursor. U S Patent 2235106A, March 18, 1941.  
201 1967-68 Pic L2.4, L1.3, A2.4, A1.3 [C4, C3, C2, C1] D1, D2, D3, D4 K4, K3, K2, K1 [CF4, CF3, CF2, CF1] DF1, DF2, DF3, DF4 Scales folded at 8√10. Duplex
500 mm x 1-3/4 x 1/4 in
"Sold in Japan." Early production has scale labels in green on cursor.  
250 1951-72 Pic DF [CF, CIF, CI, C] D, L Folded at √10. K, A [B, TI1, TI2, SI] D, DI Duplex
250 mm x 1-5/8 x 1/4 in
General Engineering and Business. Replaced models 150 and 2600. Most with usual German silver end brackets but a few (<10) specimens with anodized black end brackets are known.
251 1951-58 Pic L, DF [CF, CIF, CI, C] D, DI Folded at π. K, A [B, T, S, ST, C] D, LL3, LL2, LL1 Duplex
250 mm x 1-5/8 x 1/4 in
Mechanical Engineer.
1958+ Pic L, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. K, A [B, T, S, ST, C] D, DI
P253 1961-72 Pic LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1 Folded at √10. K, A [B, TI2, TI1, SI] D, DI Duplex
250 x 41 x 5 mm
"Vectolog." Elaborate clamshell case. All-plastic version of model 264. H-O 1774-00 (-1964);
Geo 341-3130 (1964+)
254W 1965-66 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at √10. K, A [B, TI, SI, C] D, DI, L Duplex
250 mm x 1-3/4 x 1/4 in
"High School Students". Basis for model 108 demo rule. Equal length stators  
1969-71 Pic Traditional stators.  
254
W-S
1970 Pic Same as above and below.
But folded at π.
K, A [B, TI, SI, C] D, DI, L   Only difference from 254W above is where front scales are folded. Only one specimen known, date code "UB" = Feb 1970.
1970 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at √10. K, A, [SIN COS, COS2, TI, SI, C] D, DI, L   Stadia scales on rear but marked 254W-S on front. Equal stators date = "OC"; others = "UB" or no code.
1971 Pic K, A [B, TI2, TI1, SI, C] D, DI, L Duplex
250 mm x 1-3/4 x 1/4 in
"High School Students." Traditional stators. Hemmi name on back of rule.  
Late 1970s Pic Same. But folded at π. KI, K, AI, A [B, S, T, CI, C] D, Ldb, P, DI   May set a record for number of different inverse scales on one side of a rule.  
254
WN
1972+ Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at √10 LL/0, K, A [B, TI2, TI1, SI, C] D, DI, L, LL0 Duplex
250 mm x 1-3/4 x 1/4 in
"High School Students." Traditional stators. Hemmi name on back of rule.  
254
WN-S
1972+ Pic Same. Folded at π.  
255 1951-58 Pic L, K, DF [CF, CIF, CI, C] D, χ, θ Folded at π. Sh1, Sh2, Th, A [B, TI2, TI1, SI, C] D,LL3,LL2,LL1 Duplex
250 mm x 1-3/4 x 1/4 in
Expert Electrical Engineer. Replaced model 155.  
1958-66 Pic L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Sh1, Sh2, Th, A [B, TI2, TI1, SI, C] D, χ, θ  
255D 1966+ Pic L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Sh1, Sh2, Th, A [B, TI2, TI1, SI, C] D, DI, χ, θ  
256 1951-67 Pic L/dB, Neper, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. A, Ĺ [Ċ, SI, TI] D, l, F Duplex
250 mm x 1-3/4 x 1/4 in
Electrical Communications. Ĺ, Ċ are L and C with dot over; these scales are about half length.  
257 1952-67 Pic L, A, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Ch A-M, Ch N-Z, M1 [M2, oF, oC, oK, F(t)] Kg/cm2, mm Hg, in Hg Vac, tw Chemical Engineer. Post 1491 (c1957-c67);
H-O 1770 (-1958-)
257L 1971+ Pic L, K, A, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Ch A-M, Ch N-Z, M1 [M2, oF, oC, oK, LM] mm Hg, Kg/cm2, in Hg Vac, tw Chemical Engineer. Hemmi name on back of rule.  
258 1951 Pic LL0, LL/0, K, DF [CF, CIF, CI, C] D, R1, R2, L Folded at π. LL/1, LL/2, LL/3 [T T, SecT ST, Cos S, C] D, LL3, LL2, LL1 Duplex
250 mm x 1-3/4 x 1/4 in
VERSALOG Ia. About 30 specimens explicitly marked "Hemmi 258" are known. All are also marked "THE FREDERICK POST CO. NO 1460" or "THE HUGHES OWENS CO. LIMITED NO. 1777." Hemmi name on back of rule. Post 1460 Versalog (1951+);
H-O 1777 Versalog (1951+).
For information about Versalog II slide rules see the second page of this Catalogue Raisonne.
259 1951-58 Pic L, K, DF [CF, CIF, CI, C] D, LL/0, LL0 Folded at π. LL/1, LL/2, LL/3, A [B, T, S, ST, C] D, LL3, LL2, LL1 Duplex
250 mm x 1-3/4 x 1/4 in
Expert Mechanical Engineer. Replaced model 159.  
1958-66 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π L, K, A [B, T, S, ST, C] D, LL0, LL/0 Expert Mechanical Engineer. Hemmi name moved to back of rule.  
259D 1966+ Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π L, K, A [B, T, S, ST, C] D, DI, LL0, LL/0  
259
DS
Late 1970s Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. LL0, LL/0, K, A [B, T, S, ST, C] D, √1, √2, L Duplex
250 mm x 1-3/4 x 1/4 in
   
260 1964+ Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. LL/0, LL0, K, A [B, T, S, ST, C] D, DI, P, L Duplex
250 mm x 1-3/4 x 1/4 in
Advanced Engineer. {3 hairlines: A: C2, hp-C2} Some rules c1970 have brand and model on bottom edge. Some marked UNIVERSITY on bottom edge.
260 1964+ Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. LL/0, LL0, K, A [B, T, S, ST, C] D, DI, P, L Duplex
1500 mm x _
Painted wood classroom demonstration rule. Cursor is single wire.  
P261 1966-72 Pic LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. T, ST, K, A [B, BI, CI, C] D, L, P, S Duplex
250 x 46 x 5 mm
Advanced Engineer (Darmstadt). Stators white or pale blue. {4 hairlines on back of cursor. A: C2, hp-C2, D: C} T-P 1420 (c1971 only), 44CB-200 (1972+)
P262 1970+ Pic LL01, LL02, LL03, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. K, A, R1, R2 [T2, T1, ST, S, C] D, L, LL00, LL0 Duplex
250 x 46 x 5 mm
Advanced Engineer (Rietz). T-P 1422 (c1971 only), 44CB-220 (1972+)
P263 1965-67 Pic P1, P2, DF [CF, CIF, CI, C] D, LL (2 scales. One has second calibration for %) Folded at 3.6 A, N [M, , S/d, C] D, G Duplex
250 x 41 x 5 mm
"Commerce." N, M have 365 divisions for dates. , S/d = pound, shilling/pence. G is a set of conversion gauge marks . Geo 341-3155 (1967+)
Hemmi 143 is pocket version.
264 1968-69 Pic LL3, LL2, DF [ CF, CIF, CI, C ] D, L, LL1 Folded at √10. K, A [B, TI2, TI1, SI] D, DI Duplex
250 mm x 1-5/8 x 1/4 in
Bamboo version of model P253, Vectolog.  
264-S 1969 Pic Same as 264 except CIF scale is green. Only specimen is owned by Mitsuru Itoh. Date code "TB."
264-S 1970? Pic LL3, LL2, DF [ CF, CIF, CI, C ] D, L dB, LL1 Folded at √10. K, A [B, TI2, TI1, SI] D, DI, χ, θ Duplex
250 mm x 1-5/8 x 1/4 in
Same as 264 except with χ and θ scales and 0 - 20 dB markings added to L scale.  
P265 1968-72 Pic P1, P2, DF [CF, CIF, CI, C] D, LL2, LL1 Folded at 3.6 A, D [G, 0-24, N] M, 0-24 Duplex
250 x 46 x 4 mm
"Business." N, M have 365 divisions for dates. G is a set of conversion gauge marks. Instructions, scale labels in Japanese.
266 1961+ Pic LL/3 (and LL/1), LL/2, LL2, A [B, BI, CI, C] D, dB L, S, T XL, XC, F, r1 (and P) [r2 (and Q), L, C, CZ] L, Z, fo (and l) Duplex
250 mm x 1-3/4 x 1/4 in
"Electronics." Announced in 1961 but not in Hemmi catalogs until 1966. Early specimens (1962) marked "Developed by SONY." LL/3, LL/1, r1, r2, P, Q are partial length scales. Also sold as Geo 341-3550 (1966+)
P267 1971-72 Pic √-3, √-2, √-1, DF [CF, CIF, CI, C] D, √-1, √-2, δ(unif.) Folded at √10 4√-4, 4√-3, 4√-2, 4√-1 [λδ(conc), λδ(Trape), λM, P] Q, L, T, S Duplex
250 x 46 x 5 mm
"Structural Design"  
269 1966+ Pic L, F, K, A [B, K', CI, C] D, LL3, LL2, LL1 CL, SL, M, TL [R, ST, T, S, C] D, DI, SinCos1, SinCos2 Duplex
250 mm x 1-3/4 x 1/4 in
Civil Engineer.  
P270 1972+ Pic J, J [T(K), Q(m/s), Q(m/s)] Hm(m), Q(m/s), Ht(m) X, X, Cz, Cmax(PPM) [He(m), Cy, CI, C] D, A, L Duplex
250 x 46 x 5 mm
"Pollution A." (air quality analysis) 19 scales in black red and blue.  
P271 1974 Pic x,xs(g/kgDA), (ice), Tφ,tφ(C), [hw,hs(mmhg), CI, C] D, v,va(m3/kgDA), t(C), t(F) [t(C)(ice), t'2.5, t(C)] Open
250 x 46 x 5 mm
Moist air. There are 13 scales--most with complicated labels.  
274 1970s Pic L, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at √10 K, A [B, TI2, TI1, SI, C] D, DI Duplex
250 mm x 1-3/4 x 1/4 in
Late model general engineering rule with scales folded at √10 and trig scales inverted. Likely sold only in Japan.
275 1950-58 Pic L, K, DF [CF, CIF, CI, C] D, c, q Folded at π. Sh1, Sh2, Th, A [B, TI1, TI2, SI, C] D,LL3,LL2,LL1 Duplex
500 mm x 1-3/4 x 1/4 in
20-inch Version of Model 255.  
1958-63 Pic L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Sh1, Sh2, Th, A [B, TI2, TI1, SI, C] D, χ, θ 20-inch Version of Model 255. Some w green scale labels on cursor.  
275D 1963+ Pic L, K, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. Sh1, Sh2, Th, A [B, TI2, TI1, SI, C] D, DI, χ, θ 20-inch Version of Model 255D. Some w green scale labels on cursor.  
279 1951-58 Pic L, K, DF [CF, CIF, CI, C] D, LL0, LL/0 Folded at π. LL/1, LL/2, LL/3, A [B, T, S, ST, C] D, LL3, LL2, LL1 Duplex
500 mm x 1-3/4 x 1/4 in
20-inch Version of Model 259. Some w green scale labels on cursor.  
1958-65 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL1 Folded at π. L, K, A [B, T, S, ST, C] D, LL0, LL/0  
279D 1965-67 Pic LL/1, LL/2, LL/3, DF [CF, CIF, CI, C] D, LL3, LL2, LL Folded at π. L, K, A [B, T, S, ST, C] D, DI, LL0, LL/0 20-inch Version of Model 259D. Some w green scale labels on cursor.  
P280 1969+ Pic T, K, A [B, CI, C] D, L, S, ST [LL1, LL2, LL3] Open
250 x 46 x 4 mm
Beginners. T-P 1414 (c1971 only), 44BB-140 (1972+); Geo 341 3645
280S 1975? Pic L, K, A [B, CI, C] D, S, ST, T cm
[LL1, LL2, LL3]
inches
Open
250 mm
All plastic. Marked "HEMMI, JAPAN, 280S" but probably made by D&P in Germany. Only known specimen found in Thailand. Same as Aristo 0903 except back of Aristo slide is blank.
P281 1970+ Pic T, K, A [B, CI, C] D, L, S, ST Blank Open
250 x 46 x 4 mm
Rietz. T-P 1410 (c1971 only), 44BB-100 (1972+); Geo 341 3640
P283 1970-71 Pic K, A, DF [CF CI, C] D, L, T, S Folded at π. [LL1, LL2, LL3] Open
250 x 46 x 4 mm
Beginners.  
300 1946 Pic G, E [F, CI, C] D, M [Blank] //Closed||
250 x 34 x 8.5mm
Decimal Calendar Rule. G scale is folded at 365; E & F folded at 3.042 = 365/12. M scale is set of gauge marks for Japanese weights & measures. Japanese language.
Models 301-999: Specialty Slide Rules
301 1957-66 Pic t, ω [CI, f, P, C] D, A, db [θ, θd, g', g] //Closed||
250 x 34 x 11 mm
Control Engineering. Four cursors! 301A is transparent overlay for 301. Post 1490 (1957-ca67)
305 1959-70 Pic TmV/S, l1 [l2, m, a] T, n [N, F t, 6u] //Closed||
125x26 x _ mm
Acoustic Design. Patent 225936, 225937.  
400 1959-68 Pic Y, A [B, CI, C] D, LL3, LL2, LL1 Ebeta, R(AI), Dist, Dose Rate, S, Isotopes (4 scales)] Egamma, Pb, Fe, Al Duplex
250 mm x 1-3/4 x 1/4 in
Radioisotope Engineering.  
401 1966 Pic d, W [Nt, D, MI, M] L t0, P [d, D, D, Na( δ)] k(P), d Duplex
250 mm x 1-5/8 x 1/4 in
"Coiled Spring Rule"  
P402 1966-68 Pic 15 scales in black, red, blue and green -- all labeled in Japanese. Only three scales are full length. Scale arrangement and range of variables differs slightly between the two models. A, DF [CF, CIF, CI, C] LL (2 scales) Folded at √10. Duplex
250 x 41 x 5 mm
Tanabe Corporate Performance Analysis combines ten measures such as Marginal Profit Ratio and Total Equity Growth into a single corporate performance score. Click here for an illustrated explanation of models P402 and P403 by Atsushi Tomozawa.
P403 1966-68 Pic P402 implements this technique for manufacturing businesses; P403 is for wholesale and retail distributors. Rule and instructions in Japanese.
405 1958-59 Pic C2F, Al2O3 [Fe2O3, C2AF] C2A, SO3, CaSO4 C2S (A Scale), CaO [SiO2(for C3S), Fe2O3, SiO2(for C2S), SO3/Al2O3] C3S, C2S (B Scale) Duplex
250 mm x 1-3/4 x 1/4 in
Cement Composition. Scale labels are chemical symbols, numbers subscripted. No scales are logarithmic. Fe2O3 and SiO2(for C2S) are separate short scales on same line. Instruction Manual published by Portland Cement Assoc. Skokie, Ill, May 1959.
410 1959-68 Pic G2, G1, F2, F1 [χ, F1G1] Z1+Z2, G', F' G2, G1, F2, F1 [χ, CI, C] D, A Duplex
250 mm x 1-3/4 x 1/4 in
Involute of Gear Wheel.  
451 ? Pic LL/3, LL/2, LL2, A [B, BI, CI, C] D, dB L, S, T Eight specialized scales, center scales are not full length. Duplex
250 mm x 1-3/4 x 1/4 in
Marked "Field Intensity" on back.  
P452 1968+ Pic LL1, LL2, LL3, CR DF [T CF, CIF, % CI, T C] R D, L, in, cm (Folded at π) ST, 3n-2 K, 2n-1 A [B, BI, CI, C] D, P, S, T Duplex
250 x 46 x 4 mm
Business. Some marked "System H. Kroon." Yellow slide, green brackets. (Post & TP have blue slide & brackets) T-P 1426 (c1971 only), 44CB-260 (1972+)
500         125 mm x _ Single uncorroborated reference.  
640S 1972 Pic K, DF [CF, CIF, CI, C] D, A, L Folded at √10. [STI, TI2, TI1, SI, CI] //Closed||
250 x 45 x 9 mm
Desk Rule Bamboo between thick plastic.  
641 1975 Pic K, A, DF [CF, CIF, B, CI, C] D, DI, L Folded at √10. [STI, TI2, TI1, SI, CI] //Closed||
250 x 45 x 9 mm
Desk Rule. Bamboo between thick plastic.  
642T 1973 Pic K, A [B, BI, CI, C] D, DI, L with over-range [T2, T1, ST, S] //Closed||
250 x 45 x 9 mm
Desk version of 64T. Bamboo between thick plastic. {3 hairlines: D: C, C}.  
651 1969 Pic K, A, DF [CF, CIF, B, CI, C] D, DI, L Folded at √10. [TI2, TI1, STI, SI, C] //Closed||
250 mm x 1-1/2 x 7/16 in
   
Models 1xxx: Circular Slide Rules
1001 1971+ Pic A, D, C, CI, L Blank Circular
80 mm
Circular.  
1002 1971+ Pic A, D [C, CI] Blank Circular
80 mm
Circular. Less elaborate than 1001.  
2600 Series Rules Introduced in 1940 (2600 Years After Founding of Japan)
2600 1950 Pic DF [CF, CI, C] D, L Folded at √10. K, A [B, TI2, TI1, SI1] D, DI Duplex
250 mm x 1-5/8 x 1/4 in
General Engineering and Business.  
2634 1949+ Pic K, DF [CF, CI, C] D, A Folded at √10. [TI2, TI1, L, SI] //Closed||
125 x 26 x 5 mm
Pocket 2664.  
P
2634
ca 1964 Pic K, DF [CF, CI, C] D, A Folded at √10. [TI2, TI1, L, SI] ||Closed||
125 mm x _
   
2640 1949-67 Pic l, A [B, CI, C] D [S, K, T] (S keyed to C/D) ||Closed||
200 x 28 x 8 mm
Beginners Slide Rule for 50W. Plastic cursor.  
2641 1952? Pic DF [CF, CI, C] D, A Folded at √10. Blank ||Closed||
200 x 28 x 8 mm
Beginners Slide Rule for 45 (which, itself, was a beginner's rule). Plastic cursor.  
2645 1945-47 Pic DF [CF, CI, C] D, A Folded at √10. [TI, L, SI] Closed
200 x 28 x 8 mm
Essentially identical to model 45 except CI scale is black. Only one specimen known.
2662 1969 Pic K, A, DF [CF, CIF, CI, C] D, DI, L Folded at √10. [B, TI, SI, C] //Closed||
250 x 34 x 11 mm
Some with 13-0-13 cm scale on bottom. See Hemmi Catalogue Raisonne 2 for a slide projector version of this rule.
2664 1940-44 Pic K, DF [CF, CI, C] D, A+L Folded at √10. [TI1, TI2, SI2, SI1] ||Closed||
250 x 34 x 9 mm
Wartime construction (bare vertical edges and back) No model number on rule. A+L scale is left half of A scale joined to right half of L scale.
1944-47 Pic //Closed||
250 x 34 x 11 mm
Better quality construction (slanted top edge, bottom vertical edge and back all covered with celluloid.)
1947-58 Pic K, DF [CF, CI, C] D, A Folded at √10. [TI2, TI1, L, SI1] Full length A scale. Full length L scale replaces SI2.  
2664S 1958+ Pic K, DF [CF, CIF, CI, C] D, A Folded at √10. [TI2, TI1, L, SI] //Closed||
250 x 34 x 11 mm
Same as 2664 except 10 mm longer overall and green CIF scale added.  
2664
S-S
1967+ Pic K, A, DF [CF, CIF, CI, C] D, DI Folded at √10. [TI2, TI1, L, SI] //Closed||
250 x 34 x 11 mm
Same as 2664S except DI scale added.  
2670 1949 Pic K, A [B, CI, C] D, L [S, S&T, T] //Closed||
500 x 40 x 12 mm
Long Rietz. Short-lived replacement for model 70. {3 hairlines: D: C, C}.  
2690 1951-68 Pic L, D [M1, M2, C] D, A [S, S&T, T] //Closed||
250 x 34 x 11 mm
Stadia. {3 hairlines: D: C, C}.  
2690A 1954   Same as 2690 "2690A" used to distinguish this rule from proposed centesimal degree model 2690B.
Click here for Hemmi Cat II--the table of Hemmi rules which had no model number.
Click here for Frederick Post Slide Rule Cross Reference
Home How to Order Slide Rules for Sale K&E Parts Relay/Ricoh Parts
  Hemmi & Post Parts Books and Literature Msc Info