Keuffel & Esser Co. Slide Rule
Manufacturer / MakerCreated by
Keuffel & Esser Co.
(founded 1867)
Date1939
Mediumplastic, metal, leather
Dimensionsruler: 2 × 12 1/2 × 1/2 in. (5.1 × 31.8 × 1.3 cm)
case: 2 1/2 × 13 × 1 in. (6.4 × 33 × 2.5 cm)
case: 2 1/2 × 13 × 1 in. (6.4 × 33 × 2.5 cm)
ClassificationsTools, Implements & Weights
Credit LineAlbuquerque Museum, gift of Mr Hal Behl
Object numberPC1988.7.2.A
DescriptionThis slide ruler from 1939 is a quintessential example of mid-20th century scientific tools used for precise calculations in engineering, physics, and other technical disciplines. It consists of a rectangular body made from cream-painted material, likely plastic or wood, with finely marked logarithmic scales in black and red ink. The slide ruler is accompanied by a transparent, movable cursor made of metal and clear plastic, which aids in accurate alignment for calculations. One both ends of the ruler are metal L shapes bolted to the ruler with H. Behl engraved in black lettering. The device is housed in a brown leather sheath embossed with personalized text for the name “HAROLD G. BEHL” in yellow capitalized text, adding a personal touch to the artifact's history. The slide rule bears the inscription “KEUFFLER & ESSER COMPANY N.Y. PAT. PEND [patent pending] MADE IN U.S.A.,” situating its production within a renowned American company that specialized in precision instruments. Its design reflects the era’s reliance on manual tools for advanced calculations before the advent of electronic calculators and computers. This tool was employed by its owner in scientific research relating to space exploration, a field of prominence in the region during and after World War II. Albuquerque’s ties to the burgeoning aerospace industry and research institutions, such as those at Sandia National Laboratories, underscore the tool’s potential significance in historical technological advancements.On View
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