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Hughes-Owens Slide Rules
Part 1 - Models 1760 to 1778

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1778
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341 3010
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341 3738
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Hughes-Owens 1967 Catalog Data
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Canada

Hughes Owens

Geotec

Canada

*The vast majority of slide rules sold by The Hughes-Owens Company, Limited in Canada were manufactured by Hemmi in Japan. This relationship began almost as soon as Hemmi began making slide rules - the 1914 Hughes-Owens catalogue featured Hemmi slide rules with laminated construction patented by Hemmi in Japan in 1912. In contrast, Post did not begin importing Hemmi slide rules into the United States until the early 1930's.

*The Hughes-Owens Company used catalogue numbers of the format 176x or 177x from 1914 through the mid-1960's. Examples or catalogue illustrations are known for every number within this range, except for 1769 and 1779.

*Sometime during 1964, Hughes-Owens changed the numbering system to a 7-digit number, with the format 341 3xxx.

*Sometime in late 1968 or early 1969, slide rules with the same model numbers were sold with the Geotec logo. It is not known whether Hughes-Owens sold or spun off the slide rule division to Geotec as a separate company, or whether Geotec was simply a brand name internal to Hughes-Owens.

*AZON purchased The Hughes-Owens Company, Limited in 1988.

*Hughes-Owens and Geotec slide rule data and original HTML copyright 2001 by John Spivey, used with permission.


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
1761 (front), Click for bigger pic, browser BACK to return
1761 (back), Click for bigger pic, browser BACK to return
1761 (well), Click for bigger pic, browser BACK to return
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
1762 (front), Click for bigger pic, browser BACK to return
1762 (back), Click for bigger pic, browser BACK to return
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
1762 (front), Click for bigger pic, browser BACK to return
1762 (back), Click for bigger pic, browser BACK to return
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
1765 (front), Click for bigger pic, browser BACK to return
1765 (back), Click for bigger pic, browser BACK to return
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
1768 (front), Click for bigger pic, browser BACK to return
1768 (back), Click for bigger pic, browser BACK to return
1768 (slide back), Click for bigger pic, browser BACK to return
1768 (well), Click for bigger pic, browser BACK to return
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
1768C (front), Click for bigger pic, browser BACK to return
1768C (back), Click for bigger pic, browser BACK to return
1768C (slide back), Click for bigger pic, browser BACK to return
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
1771 (front), Click for bigger pic, browser BACK to return
1771 (back), Click for bigger pic, browser BACK to return
1771 (slide back), Click for bigger pic, browser BACK to return
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
1772 (front), Click for bigger pic, browser BACK to return
1772 (back), Click for bigger pic, browser BACK to return
1772 (slide back), Click for bigger pic, browser BACK to return
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
1773 (front), Click for bigger pic, browser BACK to return
1773 (back), Click for bigger pic, browser BACK to return
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
1777 (front), Click for bigger pic, browser BACK to return
1777 (back), Click for bigger pic, browser BACK to return
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
1777 (front), Click for bigger pic, browser BACK to return
1777 (back), Click for bigger pic, browser BACK to return
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

Archive Navigation, CLICK on the LOGO to Visit
Hughes Owens

Hughes-Owens
1760
to
1778
Hughes Owens

Hughes-Owens
341 3010
to
341 3738
Geotec

Geotec
341 3010
to
341 3690
COMING SOON



CLICK
to go to the
CATALOG
Archive
Go to the Sun/Hemmi Archive
HEMMI

CLICK
to go to the
Hemmi/Sun
Archive
Click to go to the Main POST Archive


CLICK
to go to the
POST
Archive
Go to the Teledyne Archive


CLICK
to go to the
Teledyne
Archive

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Hughes-Owens and Geotec slide rule data and original HTML copyright 2001 by John Spivey, used with permission.

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