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THACHER CYLINDRICAL SLIDE RULE MODEL 4012. Thacher's Calculating Instrument, New York: Keuffel & Esser, 1925. image 1
THACHER CYLINDRICAL SLIDE RULE MODEL 4012. Thacher's Calculating Instrument, New York: Keuffel & Esser, 1925. image 2
THACHER CYLINDRICAL SLIDE RULE MODEL 4012. Thacher's Calculating Instrument, New York: Keuffel & Esser, 1925. image 3
Lot 20

THACHER CYLINDRICAL SLIDE RULE MODEL 4012.
Thacher's Calculating Instrument, New York: Keuffel & Esser, 1925.

13 – 23 October 2024, 12:00 EDT
Online, New York

US$800 - US$1,200

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THACHER CYLINDRICAL SLIDE RULE MODEL 4012.

Thacher's Calculating Instrument, New York: Keuffel & Esser, 1925. Multi-faceted cylindrical slide rule with paper-covered rules, brass end caps, wooden handles at each end, affixed to a wooden base, printed instructions to base, wooden lidded case with Keuffel & Esser manufacturer's label on inside of lid bearing inked serial number 451, and dated "5.21.25." Overall 545 x 144 x 135 mm (21 1/2 x 5 5/8 x 5 1/2 inches).

Edwin Thacher was an engineer at the Keystone Bridge Company. He designed the circular slide rule, which was patented in 1881, to assist in his calculations designing railway bridges. The cylindrical form allowed for what would be a 59-foot conventional slide rule to take up less than 2 feet. The rule includes scales for multiplication and division as well scales for finding squares and square roots.

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