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Thacher's calculating instrument

Colorado School of Mines. Information & Technology Solutions
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2018
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Computers
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Mines Technology Museum
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https://hdl.handle.net/11124/172490
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Abstract
Invented by Edwin Thacher, an American bridge engineer. Patented in 1881, production of this 20-scale cylindrical slide rule was assumed by Keuffel and Esser Co. of New York by 1897. This unit dates to approximately 1920, serial #3499. The 20 scales provide an effective length of 30 feet with an accuracy of 4 to 5 digits. Scales for square roots are also included.
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