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THACHER CYLINDRICAL SLIDE RULE MODEL 4012 No 5343, New York: Keuffel & Esser, c.1920, multi-faceted cylindrical slide rule with wood end caps, affixed to wooden base by brass guides, instructions to base, mahogany lided case with matching serial number, Keuffel & Esser label inside case lid, image 1
THACHER CYLINDRICAL SLIDE RULE MODEL 4012 No 5343, New York: Keuffel & Esser, c.1920, multi-faceted cylindrical slide rule with wood end caps, affixed to wooden base by brass guides, instructions to base, mahogany lided case with matching serial number, Keuffel & Esser label inside case lid, image 2
Lot 47

THACHER CYLINDRICAL SLIDE RULE MODEL 4012
No 5343, New York: Keuffel & Esser, c.1920, multi-faceted cylindrical slide rule with wood end caps, affixed to wooden base by brass guides, instructions to base, mahogany lided case with matching serial number, Keuffel & Esser label inside case lid,

5 November 2020, 10:00 PST
Los Angeles

Sold for US$956.25 inc. premium

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THACHER CYLINDRICAL SLIDE RULE MODEL 4012

No 5343, New York: Keuffel & Esser, c.1920, multi-faceted cylindrical slide rule with wood end caps, affixed to wooden base by brass guides, instructions to base, mahogany lided case with matching serial number, Keuffel & Esser label inside case lid, 545 x 144 x 135 mm (21 1/2 x 5 5/8 x 5 1/2 inches).
*WITH: THACHER, EDWIN. Directions for Using Thacher's Calculating Instrument. New York: Keuffel & Esser, 1920. Original wrappers.
Provenance: The Computer History Collection of Serge Roubé.

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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