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Hemmi Slide Rule Catalogue Raisonné
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The Hemmi Catalogue Raisonne
(both parts I and II) by Paul Ross of the SRTCo.us is being preserved at ISRM.
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 contains
descriptions of Hemmi-made slide rules for which I have
not been able to determine a model number. They are usually
rules with names rather than numbers or military rules or
rules sold under another company's (Post, Foxboro, SKF, etc.)
name.
Paul Ross, Feb 2022
|
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]
|
//Closed|| 250 x 28 x 9.5 mm |
Mannheim.
("Normal") Listed as obsolete starting
in 1936 but price listed in Hemmi catalogs through
1937 and available from Frederick Post (as model
1449) through 1940. |
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 Cos²) added to front of
slide. Dates probably later than model
1. |
|||||
2 |
1913-29 |
Pic |
Same as model 1 but with decimal-indicating cursor. | //Closed|| 250 x 28 x 9.5 mm |
Discontinued ca1929.
|
Tamaya 1937 (1913-27); H-O 1767 (-1914-28-) |
|
3 |
1919-29 |
Pic |
LL2, A [B, C] D, LL3 |
[S, L, T] Gutter: E, F |
//Closed|| 250 mm x 1½ in 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); H-O 1770 (1928), 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] |
//Closed|| 500 mm x 1¼ x 13/32 in |
Listed as obsolete by Hemmi
in 1936 but price listed through 1937. In
Post catalog (model 1450) until WWII and in H-O
catalog (model 1772) though1948. |
Tamaya 1899 (1916-27); H-O 1772 (1928); Post 1450 (1936-WWII). |
6 |
1919-29 |
Pic |
A [B, C] D |
[S, L, T] |
//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] |
/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 ca1929. |
Tamaya 1900 (1916-27) |
||
10 |
1926-29 |
Pic |
A [B, C] D |
[S, L, T] |
//Closed|| 250 mm |
Ten-inch extra fine with
"extended lens" magnifier. Discontinued ca1929. |
Tamaya 2148 (1927) |
11 |
1926-29 |
Pic |
Same as10
but with decimal-indicating "extended-lens" cursor.
|
Discontinued ca1930. |
Tamaya 2180 (1927) |
||
12 |
NA |
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 ca1929. |
Tamaya 2782 (1927) |
||
13 |
1926-29 |
Pic |
Same as 4
but with decimal-indicating "extended-lens" cursor. |
Discontinued ca1929.
|
Tamaya 2783 (1927) |
||
14 |
1926-29 |
Pic |
A [B, C] D |
[S, L, T] |
||Closed|| 100 mm x 11/16 x 7/32 in |
Vest Pocket Mannheim with
square edges. |
Tamaya 2784 (1927); Hemmi 35 (1930+) |
15 |
1926-29 |
Pic |
Same as 14 but with
decimal-indicating cursor. |
Discontinued ca1929.
|
Tamaya 2785 (1927) |
||
16 |
1926-29 |
Pic |
Same as 14
but with magnifying cursor. |
Discontinued ca1929. |
Tamaya 2786. Hemmi 35ML (1930+) |
||
17 |
1926-29 |
Pic |
Same as 14
but with magnifying decimal-indicating cursor. |
Discontinued ca1929. |
Tamaya 2787 |
||
18 |
1826-29 |
Pocket kit including pen, pad and model 15 slide rule. | Discontinued ca1929.
|
Tamaya 2788 |
|||
19 |
1927 |
Pic |
A [B, C] D |
[S, L, T] ? |
250 mm |
Student version
of model 1. Model number may have been changed
to 40 before any were actually sold. |
|
Model Numbers 20-24
were assigned to Classroom Demo Slide Rules before WWII;
Student Rules after WWII. |
|||||||
20 | 1932-42 |
NA |
A [B, CI, C] D, K |
[S, L, T] |
Demo 2000 mm |
Demonstration Mannheim (Model
50) |
Tamaya 4451 (1932) |
21 |
1932-42 |
NA |
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 |
1951-59 |
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. Some (1955 only?) sandalwood, not bamboo.
Celluloid cursor. |
|
P23 |
1957-69 |
Pic |
A [B, CI, C] D |
A [B, CI, C] D |
Open 180 mm x 1 x 1/8 in |
Student Mannheim w CI scale. Hemmi's first plastic-based rule. |
|
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. |
|
P24 |
1963-69 |
Pic |
DF [CF, CI, C] D, A Folded at √10. |
Blank |
Open 180 mm x 1 x 1/8 in |
Student. |
|
Models 30-39: Miscellaneous Four- and Five-inch Closed Body Slide Rules | |||||||
30 |
1930-43 |
Pic |
A [B, C] D |
[S, L, T] |
//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. 1000¥ ($2.78) in 1969. |
Tamaya 4453 (1927); Post 1447 (1931-33); Post 1440 (1934-WWII) |
31 |
1930-42 |
Pic |
Same as 30 but
with decimal-indicating cursor. |
No CI scale |
Tamaya 4454 |
||
32 |
1930-42 |
Pic |
Same as 30 but with magnifying cursor. | Tamaya
4455; Post 1447M (1931-33); 1441 (1934-WWII); Boston Blue Print 1441; US Blue 1888. |
|||
33 |
1930-42 |
Pic |
Same as 30 but
with decimal-indicating magnifying cursor |
No CI scale |
Tamaya 4456 |
||
30R |
MIOJ-1950 |
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. Post 1440. |
30 |
1951-EOB |
Pic |
Same
rule with "R" dropped from model number on case
and box. All-plastic cursor after ca 1970. |
||||
32R |
MIOJ-1950 |
Pic |
Same as 30R but with magnifying cursor
|
Post
1441(WWII-1971); T-P 44DA-410 (1972+); H-O 1760 (-1952-64); Geo 341-3405 (1964+) US Blue 1888 (MIOJ) |
|||
32 |
1951-EOB |
Pic |
Same
as 30 but with magnifying cursor. |
||||
P33S |
1971 |
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 4.5 mm |
Pocket Improved Mannheim.
Unique size. |
Geotec 341-3610 |
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 |
1932-42 |
NA |
A [B, C] D | Blank | //Closed|| 125 mm x 15/16 x 5/32 in |
Thin Pocket Mannheim with
blank back. |
Post 1443
(1931-WWII) |
MIOJ |
Pic |
//Closed|| 125 x 26 x 5 mm |
|||||
34π |
1932-42 |
Pic |
CF [DF,
CI, C] D Folded at π |
[S, L, T] (S keyed to C/D) |
//Closed|| 125 mm x 15/16 x 5/32 in |
Thin Pocket Mannheim with
folded scale. |
Post 1444
(c1935-WWII); H-O 1762 (-1935-WWII) |
MIOJ |
NA |
//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|| 125 mm x 15/16 x 1/8 in |
Thin Pocket Mannheim w CI
Scale. |
Post 1444
(c1935-WWII); H-O 1762 (-1935-WWII) |
1955-68 | NA |
//Closed|| 125 x 26 x 5 mm |
|||||
34RK |
1936-EOB |
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 |
1936-42 |
Pic |
A [B, C] D |
[S, L, T] |
//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] |
||Closed||
100 mm x 11/16 x 3/16
in |
Vest Pocket Mannheim with 4-inch and 10-cm measuring scales on square edges | Hemmi 14; Post 1437 (c1935-WWII); H-O 1761 (-1935-48-) |
35ML |
1930s |
Pic |
Same as 35 but with magnifying cursor | Hemmi
16 |
|||
P35 B35 |
1959-61 |
Pic |
K, DF [CF, CI, C] D, A Folded at √10. |
Blank |
Open 115 mm x 1 x 1/8 in |
Marked "B35"
(factory error for "P35"?); thin bamboo core
covered with PVC (not celluloid); scales printed
(not engraved). All known specimens also marked H-O
1759. |
|
P35S |
1971 |
Pic |
K, DF [CF, CI, C] D, A Folded at √10. |
[LL1, LL2, LL3] |
Closed 125 x 28 x 4.6 mm |
||
36 |
1936-WWII |
Pic |
A [B, CI,
C] D |
[S, L, T] |
Closed 125 mm x ¾ 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 1/8 in |
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. 450¥ ($1.25) in 1969. | |
P37 |
1966-70 |
Pic |
(1), (2),
D [C, CI, B] MD1, MD2 |
[B, PR1, PR2, PR3] |
Closed 125 x 28 x 4.6 mm |
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. Reverse slide to read B, PR scales..
{Two hairlines: D: 1.2}. 700¥ ($1.94) 1969. |
|
P39 |
NA |
K, A, DF [CF, CIF, CI,
C] D, DI, L Folded at ? |
[B, TI, SI, C] |
Closed 125 mm |
Single uncorroborated reference. |
||
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] |
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 |
1932-42 |
Pic |
A [B, C] D |
[S, L, T] |
Closed 125 mm |
Pocket Mannheim. No measuring scales | Tamaya 4459 (1932) |
42 |
1932 |
Pic |
A [B, C] D |
[S, L, T] |
Closed 250 x 28 x 8 mm |
Model 40 w measuring scales on BACK. | Tamaya 4460 (1932) |
43 |
1932 |
NA |
Same as 42 but
with decimal-indicating cursor. |
Tamaya 4461 (1932) |
|||
44 |
1932 |
Pic |
A [B, C] D |
[S, L, T] |
Closed 125 mm x 15/16 x ¼ in |
No slant; cm & inch scales on back of rule. | Tamaya 4462 (1932) |
45 |
1932 | NA |
Same as 44 but with decimal-indicating cursor. | Tamaya 4463 (1932) |
|||
45 |
1949-68 |
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 |
1936-42 |
Pic |
A [B, C] D |
Blank |
Special. 125 mm
x 1 in |
"Cardboard covered in transparent
celluloid with leather sheath." |
|
47 |
1936-42 |
Pic |
A [B, C] D |
[S, L, T] |
//Closed|| 250 x 28 x 8 mm |
Thin successor to model
1/1. |
Post 1449T (1937-WWII) |
48 |
1932-42 |
Pic |
A [B, C] D |
[S, L, T] |
//Closed|| 125 mm x 15/16 x ¼ in |
Pocket Mannheim. Thin
successor to model 6. |
|
40F |
1968-69 |
Pic |
K, DF [CF, CI, C] D, A Folded at √10 |
[TI, L, SI] |
Closed 250 x 28 x 8 mm |
Fuji 85. |
|
40RK |
1949-69 |
Pic |
A [B, CI,
C] D, K |
[S, L, T] (S keyed to A/B except Staedtler 944-55 keyed to C/D) |
Closed 250 x 28 x 8 mm |
Improved
Mannheim. ("Slide Rule with CI and K Scale" in
early literature) |
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 1¼ x 9/32 in |
T-P 44BA-470 (1972+); H-O 341-3526 (1972+) |
|||
40-50 |
Pic |
Overhead projection rule for Hemmi model 40RK. | Projection 305
x 182 x 12 mm |
||||
P 40RK |
1967-69 |
Pic |
A [B, CI,
C] D, K |
[S, L, T] |
Open 250 x 28 x 8 mm |
All-Plastic Improved Mannheim.
Hard plastic case. |
Post 1447P (c1967); Geo 341-3530 (c1967) |
43A |
1961-71 |
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-EOB |
Pic |
A [B, CI,
C] D, K |
[T, L, S] (S keyed to C/D) |
Closed 200 x 28 x 6.4 mm |
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 6.4 mm |
Plastic version of 43A.
Indices for reading trig scales on back of rule.
|
|
45K |
1962-EOB |
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 |
1965-69 |
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-)
Scales folded at π. |
P45D |
1973-EOB |
Pic |
K, DF [CF, CI, C] D, A Folded at √10. |
[T, L, S] |
Closed 200 x 28 x 6.4 mm |
"Junior High
School Students." Like P45S except trig scales
not inverted and no indices on back of rule; slide
must be reversed. |
|
P45S |
1969-73 |
Pic |
K, DF [CF, CI, C] D, A Folded at √10. |
[TI, L, SI] |
Closed 200 x 28 x 6.4 mm |
Closed body all-plastic
version of 45K. Simpler construction than P45K. |
|
Models 50-59: "Improved" Mannheim Slide Rules (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 x 10.5 mm |
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-MIOJ |
Pic |
A [B, CI,
C] D, K |
[S, L, T] |
//Closed|| 250 x 28 x 8 mm |
Thin version of 50, 50/1
but accepts standard cursor. |
Post 1452T (1936-WWII). |
50π/1 |
1936-42 |
Pic |
A, DF [CF, CI, C] D, L Folded at π. |
[S, S&T, T] |
//Closed|| 250 x 28 x 10.5 mm |
Post 1455 (c1935-WWII). |
|
50W | 1951-EOB (For Post) |
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 |
1965?-68? |
NA |
A [B, CI, C] D, K |
Blank |
Open? 250 mm x 1½ in |
Improved Mannheim. |
|
50-20 |
1935-48 |
Pic |
A [B, CI, C] D, K |
[S, L, T]
|
//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 |
1932-42 |
Pic |
Same as 50/1,
50/3 but with decimal-indicating cursor. |
Formerly model 103. | Tamaya 4466, 4467 (1932). |
||
52 |
1932-42 |
Pic |
A [B, CI,
C] D |
[S, L, T] |
//Closed|| 125 mm x 15/16 x 11/32 in |
Thicker than
34R. |
Tamaya 4468; Post 1448 (1936-37). |
53 |
1932-42 |
Pic |
Same as 52 but
with decimal-indicating cursor. |
Tamaya 4469 (1932). |
|||
54 |
1936-42 |
Pic |
A [B, CI,
C] D, K with over-range |
[S, L, T] |
//Closed|| 150 x 26 x 6 mm |
"Extra Fine Improved Mannheim"
with magnifying cursor. |
Post 1453 (c1935-WWII). |
55 |
1936-42 |
NA |
Same as 54 but
without magnifying cursor. |
||||
Models 60-79: Rietz Slide Rules ( K, A [B, C] D, L and [S, S&T, T] ) | |||||||
60/1, 60/3 |
1932-3x |
Pic |
K, A [B, C] D, L |
[S, S&T, T]
|
//Closed|| 250 mm x 1¼ x 13/32 in |
Rietz. Single line model 60/1 discontinued ca 1930. | Tamaya 4470,
4471 (1932) |
193x-42 |
Pic |
K, A [B, C] D, L with over-range |
|||||
61/3 |
1932-42 |
NA |
Same as 60/3
but with decimal-indicating cursor. |
||||
62/3 |
1932 |
NA |
K, A [B, C] D, L |
[S, S&T, T] |
//Closed|| 150 mm |
Extra Fine Rietz. | Tamaya 4472,
4473 (1932) |
63/3 |
1932 |
NA |
Same as 62/3
but with decimal-indicating cursor. |
||||
64,
64/1, 64/3 |
1932-68 |
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 |
1932-42 |
Pic |
Same as 64/3 but with decimal-indicating cursor. | //Closed|| 250 x 34 x 11 mm |
Tamaya 4475 (1932) |
||
66 |
1932-68 |
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 |
1936-42 |
Pic |
Same as 66 but
thin. |
||||
67 |
1932-42 |
NA |
Same as 66 but
with 3-line magnifying cursor.
|
Tamaya 4477 (1932) |
|||
68 |
1932-42 |
NA |
Same as 66 but
with 3-line decimal-indicating cursor.
|
Tamaya 4478 (1932) |
|||
69 |
1932-42 |
NA |
Same as 66 but
with 3-line decimal-indicating magnifying cursor.
|
Tamaya 4479 (1932) |
|||
70 | 1932-43 |
Pic |
K, A [B, CI, C] D, L some 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) |
1951-70 |
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-EOB |
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 |
1930-32 |
Pic |
LL2, A [B,
CI, C] D, LL3 No over-range |
No over-range [S, L, T] E, F widely separated in gutter. |
//Closed|| 250 mm x 1 ¼ in x 10 mm |
Electro. LL scales keyed to offset "W" gauge mark. No over-range. Same as model 3 with CI scale added. | Hemmi 3; Tamaya 4481, 4482 (1932); H-O 1770 (-1928-c50); Post 1456 (c1934-WWII) |
1932-33 |
Pic |
//Closed|| 250 x 34 x 11 mm |
Same as preceding but on
slightly wider body. |
||||
1934-36 |
Pic |
[S, L, T]
E, F close together in gutter |
Same as preceding
but no "W" gauge mark. E, F close together
in gutter. |
||||
1936-52 |
Pic |
LL2, A [B, CI, C] D, LL3 with over-range |
Same
as preceding but with over-range extensions. |
||||
81/1,
81/3 |
1932-42 |
Pic |
Same as 80/1, 80/3 but with decimal-indicating cursor. | Details
vary depending upon date of manufacture.
See model 80. |
Hemmi 4; Tamaya 4482, 4484 (1932) |
||
82 | 1932-37 |
NA |
Same as 80/1 except short. | //Closed|| 125 x _ x 9 mm |
Tamaya 4485 (1932) |
||
83 |
1932-37 |
NA |
Same as 82 but
with decimal-indicating cursor. |
Tamaya 4486 (1932) |
|||
84 |
1932 |
NA |
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 |
MIOJ |
Pic |
db, Neper, A [B, CI, C] D |
[TI2, TI1, L, SI1] |
//Closed|| 250 x 34 x 11 mm |
Not electro, therefore model
number 85 is inappropriate. {3 hairlines: A: C2,
1.307} (Why 1.307?) |
Rare. |
80K |
1953-70 |
Pic |
E, F, A [B, CI, C] D, LL2, LL3 with over-range |
[S, L, T] 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/Metric HP. {3-line cursor: A: hp, C2}. |
|
86/3 |
1936-42 |
NA |
LL2, A [B, CI, C] D, LL3 with over-range |
[S, L, T] Gutter: E, F |
//Closed|| 150 x 26 x 8 mm |
"Extra fine Electro." Hp gauge
mark. No W mark. E,F scales close together in gutter.
{Three hairlines: A: hp, C2}. |
|
87/3 |
1936-42 |
NA |
Same as 86/3
but with magnifying cursor. |
||||
86/3K |
1950 |
Pic |
LL2,
A [B, CI, C] D,
LL3 with over-range |
[S, L, T]
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 |
1951 |
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] 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}. |
|
Models 90-99: Stadia Slide Rules |
|||||||
90 |
1932-42 |
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 |
NA |
Same as 90 |
||||
90B |
1939? |
Pic |
Same as 90 but
uses "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 were never manufactured. | |||
91 |
1932-42 |
Pic |
Same as 90 but
with decimal-indicating cursor
|
Tamaya 4490 (1932) |
|||
91A |
1939? |
NA |
Same as 91. | "91A" used to distinguish this rule
from proposed centesimal degree model 91B. |
|||
92 |
1932-42 |
Pic |
L, D [M1, M2, C] D, A |
[S, S&T, T] Bottom Edge: K, IA |
//Closed|| 150 x 26 x 9.6 mm |
"Extra Fine Stadia." Two calculating scales on bottom edge. {3 hairlines: D: C, C}. | Tamaya 4491 (1932) |
93 |
1932-42 |
Pic |
Same as 92 but
with magnifying cursor. |
Tamaya 4491 (1932) |
|||
94 |
1932-42 |
NA |
Same as 92 but
with decimal-indicating cursor. |
Tamaya 4491 (1932) |
|||
95 |
1932-42 |
NA |
Same as 92 but
with decimal-indicating magnifying cursor |
Tamaya 4491 (1932) |
|||
96 |
1936-43 |
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 version of model 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; all
were replaced by modern numbering system about
1930. |
|||||||
100 |
1926-27 |
Pic |
A [B, CI, C] D |
[S, L, T] |
//Closed|| 250 mm |
Short lived. |
Tamaya 2790 (1927) |
101 |
1926-27 |
Pic |
Same as 100
but with decimal indicating cursor.
|
Tamaya 2791 (1927) |
|||
102 |
1926-28 |
Pic |
A [B, CI,
C] D, K |
[S, L, T] |
//Closed|| 250 x 28 mm |
Improved Mannheim. Model
number changed to 50/1 ca 1928. |
Tamaya 2792 (1927), H-O-1771 |
103 |
1926-28 |
Pic |
Same as 102
but with decimal-indicating cursor. |
Model
number changed to 51/1 ca 1928. |
Tamaya 2793, (1927) |
||
104 |
1927 |
Pic |
LL2, A [B, CI, C] D, LL3 No over-range |
[S, L, T] 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 |
Pic |
Same as 104 but with decimal-indicating cursor. | Hemmi
83, Tamaya 2995 |
|||
106 |
1927 |
NA |
Same as 104
but with magnifying cursor. |
Hemmi 84, Tamaya 2996 |
|||
107 |
1927 |
NA |
Same as 104
but with magnifying decimal-indicating cursor. |
Hemmi 85, Tamaya 2997 |
|||
Models 100-109: Large Classroom Demonstration Slide Rules | |||||||
100 |
1951-68 |
Pic |
DF [CF, CI, C] D, A Folded at √10. |
[TI, L,
SI] |
Demo 1000 mm |
Demonstration version of
model 45. |
|
100K |
1969-71 |
Pic |
K, DF [CF,CI,
C] D, A Folded at √10 |
[TI, L,
SI] |
Demo 1000 mm |
Demonstration version of
model 45K |
|
101 |
1951-68 |
NA |
ℓ, A [B, CI, C] D |
[S, K, T] (S keyed to C/D) |
Demo 1000 mm |
Demonstration version of
model 2640. |
|
101A |
1967-EOB | 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 |
1954-68 |
Pic |
CI, C, [D, A] |
Blank |
Demo 1000 mm |
Demonstration version of
model 22. |
|
103 |
1959-EOB |
NA |
K, DF [CF, CIF, CI, C]
D, A Folded at √10. |
[TI1, TI2, L, SI] |
Demo 1500 mm |
Demonstration version of
model 2664S. |
|
104 |
1959-69 |
NA |
Demo 1000 mm |
Demonstration. |
|||
107 |
1969-EOB |
NA |
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? |
NA |
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: Specialty Slide Rules |
|||||||
110 |
1937-MIOJ |
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 slide
rule. 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 |
1968-69 |
Pic |
LL3, LL2, DF [CF, CIF, CI, C] D, L,
LL1 |
K, A [B, TI2, TI1,
SI] D, DI |
Projection
305 x 182 x 12 mm |
Overhead projection rule
for model P253. Sold with five masks for obscuring
irrelevant scales. |
¥10,000 in catalog dated
6911 |
DP122 |
1968-69 |
Pic |
K, A, DF [CF, CIF, CI]
D, DI, L |
K, A, DF [B, TI2, TI1,
SI, C] D, DI, L |
Projection 305 x
182 x 12 mm |
Overhead projection rule
for models 2662 and 2664S. Sold with five masks for
obscuring irrelevant scales. |
|
Models 130-139: Darmstadt Slide Rules
(L, K, A [B, CI, C] D, Cos, Sin, Tg and [LL1, LL2,
LL3]) and Variants |
|||||||
130 |
1950-69 |
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 1½ 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 by HEMMI in 2005 to
specifications of ISRG and Japanese collectors
and sold by subscription. |
|
136 |
1951-68 |
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 Duplex Slide Rules |
|||||||
140 |
MIOJ |
Pic |
DF [CF, CI, C] D, L Folded at √10. |
K, A [B, TI, SI, C] D, DI |
Duplex 150 mm x 1 3/16 x ¼ in |
Hemmi's first "pocket" duplex.
Body is short version of old narrow model 150.
|
|
141 P141 |
1960-EOB |
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 |
Air conditioning
duct design. Bamboo (141) and all-plastic
(P141) versions. Same blank as 149. All-plastic
version marked "'Carrier' Ductuler" (Toyo Carrier
Corp). Some bamboo specimens carry no brand name,
some marked "Carrier 50210," others marked "Shin Nippon
Kucho." (SNK was spun off from Toyo Carrier in 1969.)
|
|
143 |
1968-69 |
Pic |
P1, P2,
DF [CF, CIF, CI, C]
D, LL (2 scales) Folded at 360. |
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 model
P263. |
149 |
1959-1962 |
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 |
1962-EOB |
Pic |
Same as 149 except
celluloid veneer covers edges. |
||||
P149A |
1976 |
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 Slide Rules |
|||||||
150 |
1925?-1932? |
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 ¼ in |
Hemmi's first duplex slide
rule. (But Hemmi called models 150, 152, 153
and 154 "Universal," not "duplex.") Copied from K&E
4088-3 whose size it exactly duplicates. |
Post 1458 (1931) Lietz 3054L (before 1932) |
1932?-MIOJ |
Pic |
Duplex 250 mm x 1 5/8 x ¼ in |
Standard (1-5/8 inch) width.
Replaced by model 250. |
Tamaya 4497 (1932) Post 1458 (1932-WWII) US Blue 1881 (--1937--) H O 1765 (1935-MIOJ) |
|||
152 |
1925-48 |
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 ¼ in |
"Electrical Engineer's Universal"
(Duplex). Often no model number. Some marked "US
Pat 1459857." (Patent 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 |
1931-EOB |
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 ¼ 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 |
1925-69 |
Pic |
DF, P', P [Q, CF, CI, Sθo] A,
D, K Folded at π. |
Sχ, Tχ, Tθo [Th,
Sh, Sh, C] D, L, χ |
Duplex 500 mm x 1¾ x ¼ in |
Electrical Engineer's Universal
(Duplex) 20". Two cursors. Early production
has scale letters eteched on cursor windows.
|
Tamaya 4499 (1932); Post 1460 (c1933-WWII) |
155 |
WWII-1951 |
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 ¼ 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 ¼ in |
"General Engineering with
Log-Log Scales." |
|
159 |
1949-52 |
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 ¼ in |
Made to specification of
F Post Co. Replaced by model 259 ("Expert Mechanical Engineer")
c1952. |
Post 1462H "POSTRIG" (c1949 - 53) |
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 x 72.5 mm |
"Inductive
Statistics." Almost three inches wide! Stator with
nomograms is about 46 mm wide. All-plastic cursor similar
to Relay/Ricoh. |
|
165 |
1953 |
Pic |
"Statistical
Sampling." No slide, just many short scales and
a cursor. |
||||
190 |
1939-42 |
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 |
1936-68 |
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 divided at 6√10. |
Duplex 400 mm x 1¾ x ¼ in |
"Precision Duplex." (Originally known as "Ultra Accuracy.") Four digit precision. Scales are divided into six segments, each 400 mm long. Early production has scale labels in green on cursor. U S Patent 2235106A, March 18, 1941. | |
201 |
1967-69 |
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 divided at 4√10. |
Duplex 500 mm x 1¾ x ¼ in |
"Sold in Japan." Scales are divided into four segments each 500 mm long. Early production has scale labels in green on cursor. | |
250 |
1950-EOB |
Pic |
DF [CF, CIF, CI, C] D, L Folded at √10. |
K, A [B, TI2, TI1,
SI] D, DI |
Duplex 250 mm x 1 5/8 x ¼ in |
"General Engineering and
Business." Replaced models 150 and 2600. About
a third have anodized black end brackets. |
|
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 ¼ in |
"Mechanical
Engineer." |
|
1958-EOB |
Pic |
L, DF [CF, CIF, CI, C] D, LL3, LL2, LL1
Folded at π. |
K, A [B, T, S, ST, C] D, DI |
H-O 1773 |
|||
P253
|
1961-EOB |
Pic |
LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1 Folded
at √10. |
K, A [B, TI2, TI1,
SI] D, DI. TI divisions= 1/12 degree |
Duplex 250 x 41 x 5 mm |
Vectolog." Elaborate
clamshell case. All-plastic version of model
264. ¥2.400 in catalog 6911. |
H-O 1774-00 (-1964); Geotec 341-3130 (1964+) |
P253 Special |
1967 |
Pic |
LL3, LL2, DF [CF, CIF, CI,
C] D, L, LL1 Folded at √10. |
K, A [B, TI2, TI1,
SI] D, DI |
Marked
"P253 Special" and "Vectolog." Only
difference from P253 is green CIF scale.
|
||
1965 |
Pic |
LL3, LL2, DF [CF, CIF, CI, C] D, L, LL1 Folded
at √10. |
K, A [B, TI2, TI1,
SI] D, DI,√3V.
|
Marked "P253 Special" and "Vectolog." Short additional scale on back marked "√3V" at left and and "volt" at right end. | |||
254W |
1963-68 |
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 1¾ x ¼ in. |
"High School Students". Basis for model 108 demo rule. Equal length stators. | |
1963-72
|
Pic |
Traditional stators. |
|||||
254 W-S |
1970s |
Pic |
Same as 254W but folded
at π. |
Same as 254W. |
Only difference from 254W is where
front scales are folded. |
Only two specimens known.
Date codes "RC" (March 1967) and "UB" (Feb 1970) |
|
1969 |
Pic |
Same as 254W.
Folded at √10. |
L, K, A [B, TI, SI, P] Q, Q', D,
DI |
With
P, Q, and Q' scales |
Date code "TC" = March 1969. |
||
1970s |
Pic |
K, A, [SIN COS, COS2,
TI, SI, C] D, DI,
L |
With stadia scales. | Equal stators date = "OC" (Mar 1964); others = "UB" (Feb 1970) or no code. | |||
1971 |
Pic |
K, A [B, TI2,
TI1, SI, C] D, DI,
L |
"High School Students." Traditional stators. Hemmi name on back of rule. | ||||
1971 |
Pic |
Same as 254W but folded at π. |
K, A [B, TI2, TI1,
SI, C] D, DI,
L |
Date code "VC" = March 1971 |
|||
1970s |
Pic |
KI, K, AI,
A [B, S, T, CI,
C] D, LdB, P, DI |
May
set record for number of different inverse scales
on one side of a rule. |
||||
1965 |
Pic |
LL/1, LL/2, LL/3,
DF [CF, CIF, ST,
CI, C] D, LL3, LL2, LL1 Folded at π. |
KI, K, AI, A [B, S, T, CI, C] D, LdB, P, DI | Equal length stators. |
|||
254WN |
1972-EOB |
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 | "High School Students." Traditional stators. Hemmi name and model number on back of rule. | ||
254 WN-S |
1972 |
Pic |
Same as 254WN except
folded at π. |
||||
1973 |
Pic |
Same as 254WN. Folded
at √10. |
L, K, A, [B, TI2, TI1,
SI, P] Q, Q', D, DI |
||||
255 |
1950-57 |
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 1¾ x ¼ in |
"Expert Electrical Engineer." Replaced model 155. | |
1958-61 |
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 |
1961-EOB |
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 |
1950-68 |
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 1¾ x ¼ in |
Electrical Communications. Ĺ and Ċ scales are about half length. | |
257 |
1952-68 | 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.,
tω |
Duplex 250 mm x 1¾ x ¼ in |
"Chemical Engineer." |
Post 1491 (c1957-67); H-O 1770 (-1958-) |
257L |
1971-EOB |
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., tω |
"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 1¾ x ¼ in |
VERSALOG Ia. About 30 specimens
marked "Hemmi 258" are known. All are also marked
"THE FREDERICK POST CO. NO 1460" or "THE HUGHES
OWENS CO. LIMITED NO. 1777." Click here for
a short history of model 258. |
Post 1460 Versalog (1951+); H-O 1777 Versalog (1951+). For information about Versalog models Ib and II see the second page of this Catalogue Raisonne. |
259 |
1950-58 |
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 250 mm x 1¾ x ¼ in |
"Expert Mechanical Engineer." Replaces model 159. | |
1958-63 |
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 |
1953-EOB |
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 |
|||
259D-S |
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 |
|||
260 |
1964-EOB |
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 1¾ x ¼ 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. ¥4,800 in catalog 6911. | |
260
Demo |
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 |
1965-EOB |
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) T-P 44CB-200 (1972+) Geotec 341-3660 |
P262 | 1965-EOB |
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), T-P 44CB-220 (1972+) |
P263 |
1964-69 | Pic |
P1, P2, DF [CF, CIF, CI, C] D, LL, LL Folded at 360. | 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 | Geotec 341-3155 (1967+) Hemmi 143 is pocket version. |
264 |
1968-EOB |
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 15/8 x ¼ in |
Bamboo version of model
P253, Vectolog. |
|
264-S |
1969 |
Pic |
K, A [B, TI, SI, P]
Q, D, DI. |
P & Q scales,
Single TI scale. |
|||
264-M |
Pic |
K, A [B, TI2,
TI1, SI] D, DI. |
A mis-marked model 264? Only known specimen was sold on Yahoo Japan, June 2018. Photo shows factory marking "264-M." | ||||
264-S |
1970s |
Pic |
LL3, LL2, DF [CF, CIF, CI,
C] D, LdB, LL1 Folded at √10. |
K, A [B, TI2, TI1,
SI] D, DI, χ, θ |
|||
P265 |
1968-72 |
Pic |
P1, P2,
DF [CF, CIF, CI, C]
D, LL2, LL1 Folded at 360 |
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-EOB |
Pic |
(LL/3 and LL/1),
LL/2, LL2, A [B,
BI, CI,
C] D, dBL, S, T |
XL, XC, F, (τ1
and P), [(τ2 and Q), L, C, Cz] L, Z, fo |
Duplex 250 mm x 1¾ x ¼ in |
"Electronics." Announced in 1961 but not in Hemmi catalogs until 1966. Early specimens (1962) marked "Developed by SONY." LL/3, LL/1, τ1, τ2, P, Q are partial length scales. Also sold as Geotec 341-3550 (1966+) | |
P267 |
1971-EOB |
Pic |
³√-3, ³√-2, ³√-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 |
1965-EOB |
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 1¾ x ¼ in |
"Civil Engineer." |
|
P270 |
1971-EOB |
Pic |
J, J
[T(ºK), Q(m³/s), Q(m³/s)] Hm(m), Q(m³/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(ºC)
[hw,hs(mmhg),
CI,
C] D, v, va(m3/kgDA), t(ºC), t(ºF) |
[t(ºC)(ice),
t'2.5, t(ºC)] |
Open 250 x 46 x 5 mm |
Moist air. There are 13 scales--most
with complicated labels. |
|
274 |
1973-EOB | 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 1¾ x ¼ in |
Late model general engineering rule with scales folded at √10 and trig scales inverted. Likely sold only in Japan. | |
274-S |
Pic |
K, A [B, TI2,
TI1, SI, C] D, DI,
dB |
|||||
NA |
dB, K, A [B, TI2,
TI1, SI, C] D, DI,
χ, ϴ |
||||||
275 |
1950-58 |
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 500 mm x 1¾ x ¼ 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 with green scale labels on cursor. |
|||
275D |
1963-69 |
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 with green scale labels on
cursor. |
||
279 |
1950-58 |
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 1¾ x ¼ in |
20-inch Version of Model 259. Some with green scale labels on cursor. | |
1958-63 |
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 |
1963-69 |
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 with green scale labels on
cursor. |
||
P280 |
1959-72 |
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; Ahrend P280. |
280S |
1976? |
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. Only
known specimen found in Thailand |
Ahrend P281; Same as Aristo 0903 except back of Aristo slide is blank. |
P281 |
1970-72 |
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. |
Ahrend P283. |
Models 300-999: Specialty
Slide Rules |
|||||||
300 |
WWII | Pic |
G, E [F, CI, C] D, M |
[Blank] |
//Closed|| 250 x 34 x 8.5 mm |
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. |
|
301 301A |
1954-69 |
Pic |
τ, 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 301 plus a transparent overlay. |
Post 1490 (1957-ca67) |
305 |
1959-70 |
Pic |
TmV/S, ℓ1 [ℓ2,
m, a] T, v |
[N, F, u] |
//Closed|| 125x26 x _ mm |
Acoustic Design. Patents 225936, 225937. | |
400 |
1959-68 |
Pic |
Y, A [B, CI, C] D, LL3, LL2, LL1 |
Eß, R(AI), Dist, Dose Rate [S, Isotopes (4 scales)]
Ev, Pb,
Fe, Al |
Duplex 250 mm x 1¾ x ¼ in |
Radioisotope Engineering. |
|
401 |
1966-69 |
Pic |
d, W [Nt, D, MI, M] L |
τo,
P [d, D, D, Na(δ)]
k(P), d |
Duplex 250 mm x 15/8 x ¼ in |
"Coiled Spring Rule." |
|
P402 |
1966-69 |
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." P402 for manufacturing businesses; P403 for wholesale and retail distributors. Rule and instructions in Japanese. | Click here for an illustrated explanation of models P402 and P403 by Atsushi Tomozawa. |
P403 |
1966-69 |
Pic |
|||||
405 |
1950-68 |
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 1¾ x ¼ 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. Accompanying Instruction Manual published by Portland
Cement Assoc. Skokie, Ill, May 1959. |
|
410 |
1959-69 |
Pic |
G2,
G1, F2,
F1 [x, F1G1]
Z1+Z2, G', F' |
G2,
G1, F2,
F1 [x, CI, C] D, A |
Duplex 250 mm x 1¾ x ¼ in |
"Involute of Gear Wheel." |
|
451 |
1969 |
Pic |
Eight specialized scales.
Center scales are not full length. |
LL/3, LL/2, LL2,
A [B, BI, CI, C] D, dBL, S, T |
Duplex 250 mm |
"Field Intensity."
There are bamboo and all-plastic versions of this rule; both are marked "451." (Not "P451") |
|
P452 |
1968-72 (For Post) |
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 & T-P have blue slide & brackets) |
T-P 1426 (c1971 only), 44CB-260
(1972+) |
500 |
1943 |
NA |
125 mm x _ |
"For Airplane." ¥8.50 in 1943
price list. No other mention. |
|||
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}. |
Ahrend 643T |
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 1½ x 7/16 in |
||
Models
1xxx: Circular Slide Rules
|
|||||||
1001 |
1971 |
Pic |
A, D, C, CI, L |
Blank |
Circular 80 mm |
Circular. |
Geotec 341-3910 |
1002 |
1971 |
Pic |
A, D [C, CI] |
Blank |
Circular 80 mm |
Circular. Less elaborate
than 1001. |
|
2600 Series Rules Introduced in 1940 (February 11, 1940 was the 2600th Aniversary of the Founding of Japan) | |||||||
2600 |
1940-51 |
Pic |
DF [CF, CI,
C] D, L Folded at √10. |
K, A [B, TI2, TI1,
SI1] D, DI |
Duplex 250 mm x 15/8 x ¼ in |
General Engineering and Business.
|
|
2634 |
1949-EOB |
Pic |
K, DF [CF, CI,
C] D, A Folded at √10. |
[TI2, TI1, L, SI]
|
//Closed|| 125 x 26 x 5 mm |
Pocket 2664. |
|
P2634 |
|
Pic |
K, DF [CF, CI, C] D, A Folded at √10. |
[TI2, TI1, L, SI] | ||Closed|| 125 mm x _ |
||
2640 |
1949-68 |
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 |
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 |
WWII |
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 |
1966-69? | 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 edge. | See Hemmi Catalogue Raisonne 2 for
a slide projector version of this rule. |
2664 | WWII |
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. |
|
MIOJ |
Pic |
K, DF [CF, CI, C] D, A Folded
at √10. |
[TI2, TI1,
L, SI1] |
//Closed|| 250 x 34 x 11 mm |
Better quality construction. Full length A scale; L scale replaces SI2. | ||
1949-58 |
Pic |
K, DF [CF, CI,
C] D, A+L Folded at √10. |
[TI1, TI2, SI2,
SI1] |
A+L scale is left half of A scale joined
to right half of L scale. |
|||
2664S |
1958-69 |
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. |
¥2,200 in catalog dated 6911 |
2664S-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 |
MIOJ |
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 |
1954-55 |
NA |
Same as 2690 | "2690A" marked on case
to distinguish model 2690 from proposed centesimal degree
model 2690B. Rules are marked just "2690." |
|||
Odds and Ends |
|||||||
P3526 |
1970s? |
Pic |
S, K, A [B, CI, C] D, L, T |
None |
||Closed|| 250 x 40 x 3 mm |
Beginner's all-plastic
slide rule marked "HEMMI, Japan, NO P3526"
but manufactured by Hope Slide Rule Mfg Co, Tokyo.
Same as Hope model 51. (The only known 'Hemmi' example
was found in New Zealand.) |
|
Copyright © 2003- International Slide Rule Museum
|