Model Number
|
Date |
Description Scales |
Equivalents |
Comments |
1760
|
1952-1958 |
4" Mannheim, magnifying cursor, 8 scales
in // A [ B CI C ] D || cm
[ S L T ] |
Hemmi 32 H-O 341 3405 Post 1441 T-P 44DA-410 US Blue 1888 |
4" pocket version of 1771, with magnifying cursor. Replaced 1761 between 1948 and 1952. $4.25 in 1958. |
1761
|
1935-1937; 1948 |
4" Mannheim, plain cursor, vertical top, 7 scales
in || A [ B C ] D || cm
[ S L T ] |
Hemmi 35 Post 1437 |
Similar to Post 1441, but with vertical top edge. $2.50 in 1937. |
1762
|
1935-1937; 1948-1958 |
5" Mannheim, 5/32 in. thick, 8 scales
in // A [ B CI C ] D
[ S L T ] - S may be read against A or D |
Hemmi 34R Post 1444 |
According to catalogs, 5/32 in. thick, however, post-WWII models are 7/32 thick. Not known when K scale added. Post sold 1444K as early as 1950. $3.25 in 1937, $4.25 in 1958. |
1762
|
1962 |
5" Mannheim, 9 scales
in // A [ B CI C ] D K
[ S L T ] - S is read against A |
Hemmi 34RK H-O 341 3425 Geotec 341 3425 Post 1444RK T-P 44DA-440 |
5" pocket version of 1771. Not known when K scale added. Post sold 1444K as early as 1950. |
1762T
|
1952 |
5" log-log duplex, 16 scales
LL1 A [ B T S C ] D LL2
LL3 DF [ CF CIF CI C ] D L |
Pickett 300 |
Picket 300. May not have been labeled Hughes-Owens. Replacement indicator listed in 1958 catalogue. |
1763
|
1914-1935 |
5" Mannheim, plain cursor, 7 scales?
inches // A [ B C ] D
[ S L T ] ? |
unknown |
Made by Hemmi |
1763T
|
1952 |
5" pocket duplex trig, 10 scales
K A [ B CI C ] D L
[ S L T ] |
Pickett 200 |
Picket 200. May not have been labeled Hughes-Owens. Replacement indicator listed in 1958 catalogue. |
1764
|
1914 |
5" Mannheim, extra fine divisions, magnifying cursor, 7 scales
cm // A [ B C ] D
[ S L T ] ? |
Nestler 12 var? |
Appears to be a Nestler 12 variant, finer divisions |
1764
|
1928-1937; 1948 |
5" Mannheim, extra fine divisions, magnifying cursor, 7 scales
inches // A [ B C ] D
[ S L T ] ? |
Post 1453 |
Made by Hemmi; finer divisions $4.50 in 1937. |
1765
|
1935-1937; 1948 |
10" Twinplex, 13 scales
DF [ CF CIF C ] D
K A [ B S T CI ] D L |
Hemmi 150 Post 1458 A. Lietz 3054L |
Clone of K&E 4088-3. Scales folded at pi. Post-war models have wider (40mm) body, although this is not shown in the 1948 catalog. $9.00 in 1937. |
1765T
|
1952 |
10" duplex trig, 14 scales
DF [ CF CIF CI C ] D L
A [ B T ST S ] D K |
Pickett 1000 |
Picket 1000. May not have been labeled Hughes-Owens. Replacement indicator listed in 1958 catalogue. |
1766
|
1935-1937; 1948 |
10" Log-log Twinplex, 16 scales
K A [ B CI C ] D T
theta Rtheta P [ Q Q' C ] LL3 LL2 LL1 |
Hemmi 152 Post 1459 |
Hemmi trig scales for direct solution of right triangle problems. $10.50 in 1937. |
1766T
|
1952 |
10" log-log duplex, 19 scales
L LL1 DF [ CF CIF CI C ] D LL3 LL2
LL0 LL00 A [ B T ST S ] D K |
Pickett 500 |
Picket 500. May not have been labeled Hughes-Owens. Replacement indicator listed in 1958 catalogue. |
1767
|
1914-1928 |
10" Mannheim, indicating cursor, 7 scales?
inches // A [ B C ] D | ?
[ S L T ] ? |
unknown |
1914 is framed indicating cursor 1928 is combination C-style and indicating cursor |
1768
|
1914 |
10" Mannheim, 7 scales
inches // A [ B C ] D | cm
[ S L T ] |
Hemmi 50? |
Slanted top edge, with ruler. This appears to be a Hemmi 50, rather than the Hemmi 40 as later 1768's were. |
1768
|
1935-1937; 1948 |
10" student Mannheim, 7 scales
A [ B C ] D
[ S L T ] |
Hemmi 40 Post 1446 A. Lietz 2974N US Blue 1876 |
Student version of 1771, without CI and K scales. Predecessor to 1768C. $1.50 in 1937. |
1768C
|
1952-1958 |
10" student Mannheim, 9 scales
A [ B CI C ] D K
[ S L T ] |
Hemmi 40RK H-O 341 3526 Geotec 341 3526 Post 1447 US Blue 1877 |
Student version of 1771. Updated version of 1768, with CI and K scales added. $3.00 in 1958. |
1770
|
1928-1937; 1948 |
10" closed frame electrical |
Hemmi 80 |
Electrical engineering. Shares model number with chemical engineering rule from 1958. $8.50 in 1937. |
1770
|
1958 |
10" duplex, chemical eng
L A DF [CF CIF CI C] D LL3 LL2 LL1
Ch. A-M N-Z M1 [ M2 oF oC oK F(t) ] Kg/cm2, mm Hg, In. Hg, Vac. Tw |
Hemmi 257 Post 1491 |
Chemical engineering. Shares model number with electrical engineering rule from 1928-1948. $16.50 in 1958. |
1771
|
1928-1937; 1948 |
10" Mannheim, 9 scales
A [ B CI C ] D K
[ S L T ] |
Hemmi 50 Post 1452 |
Known cursor variations include aluminum framed glass cursor, frameless cursor, C-style cursor, and stainless steel framed glass cursor. |
1771
|
1952-1958 |
10" Mannheim, 9 scales
A [ B CI C ] D K
[ S L T ] |
Hemmi 50W H-O 341 3215 Geotec 341 3215 Post 1452W T-P 44BA-520 |
Universal Mannheim. Narrow body illustration appears in catalog through 1958, although the wide body was introduced around 1950-51. $6.50 in 1937, $8.50 in 1958. |
1772
|
1928 |
20" Mannheim, 7 scales?
inches // A [ B C ] D
[ S L T ] ? |
Hemmi 50-20? |
According to 1928 catalogue, it is Graduated like No. 1767 |
1772
|
1935-1937; 1948-1958 |
20" Mannheim, 9 scales
inches // A [ B CI C ] D K
[ S L T ] |
Hemmi 50-20 |
20" version of 1771. Much more massive than the comparable K&E N4053-5. $17.50 in 1937, $40.00 in 1958. |
1773
|
1928 |
10" all metal
with reverse and cube scales |
Richardson? |
According to 1928 catalogue, all metal, cannot twist or shrink, with reverse and cube scales. Shares model number with H-O version of Hemmi 251 from 1960. |
1773
|
1960 |
10" duplex, 19 scales
L DF [ CF CIF CI C ] D LL3 LL2 LL1
K A [ B T S ST C ] D DI |
Hemmi 251 |
Shares model number with all-metal rule from 1928. |
1774-00
|
1960's |
10" Vectolog, 18 scales
LL3 LL2 DF [ CF CIF CI C ] D L LL1
K A [ B TI2 TI1 SI ] D DI |
Hemmi P253 H-O 341 3130 |
Vectolog |
1775
|
1914-1937; 1948-1958 |
Halden Calculex, 11 scales
L A | B C1 C2
S? CI | DI K1 K2 K3 |
Halden Calculex |
A & B are same as C & D on regular rule. C1, C2 correspond to R1 R2 on Versalog. K1,2,3 are cube roots read against A & B. $9.15 in 1937, $15.75 in 1958. |
1776
|
1960's |
10" Versatrig, 18 scales
K DF [ CF CIF CI C ] D R1 R2
L A [ TT SecT ST CosS C ] D DI |
H-O 341 3120 Post 1450 T-P 44CA-500 |
Versatrig |
1777
|
1952-1960 |
10" Versalog Ia, 23 scales
LL0 LL/0 K DF [ CF CIF CI C ] D R1 R2 L
LL/1 LL/2 LL/3 [ TT SecT ST CosS C ] D LL3 LL2 LL1 |
Hemmi 258 Post 1460 |
Versalog Ia, COS scale in navy. $25.00 in 1958. Manual was $1.50, case $7.00. |
1777
|
1960-1964 |
10" Versalog Ib, 23 scales
LL0 LL/0 K DF [ CF CIF CI C ] D R1 R2 L
LL/1 LL/2 LL/3 [ TT SecT ST CosS C ] D LL3 LL2 LL1 |
H-O 341 3010 Geotec 341 3010 Post 1460 |
Versalog Ib, COS scale in green |
1778
|
1960's |
5" Versalog Ib, 23 scales
LL0 LL/0 K DF [ CF CIF CI C ] D R1 R2 L
LL/1 LL/2 LL/3 [ TT SecT ST CosS C ] D LL3 LL2 LL1 |
H-O 341 3050 Geotec 341 3050 Post 1461 |
Pocket version of 1777, Versalog Ib, COS scale in green |