April 24, 2024
Thacher's Calculator Slide Ruler Keuffel & Esser Hoboken, New Jersey Thatcher
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This is a Thacher's Calculating Instrument in great overall condition.In 1881, Edwin Thacher, an American bridge engineer patented this cylindrical slide rule, 4 inches in diameter and 18 inches long. Interestingly, the company misspelled Mr. Thacher's name as 'Thatcher' for the entire life of the instrument's production (see patent photo).The cylindrical rule can be both rotated and moved horizontally within an open network of 20 pairs of scales, mounted on metal bars, the open network itself also capable of rotating as a unit.The 20 scales afford the instrument an effective length of 30 feet, and an accuracy of 4-5 digits. Scales for square roots and logarithms are also included. The inner drum spins within the outer cylinder as well as slides out.Instructions are mounted permanently on the base.Thacher's Slide Rule was produced by the Keuffel and Esser Company of New York (Model No. 4012). This example is in unusually clean condition. The scales are mostly in good condition except in a few spots as shown in the pics. The base-mounted instructions are all clearly legible. The brass retains most of its original lacquer, in near perfect condition, and the maple handles show almost no sign of use. The case is also in good condition.This instrument is Serial Number 3731. Overall, an extremely attractive instrument with a wonderful
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