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ANTIQUE MATHEMATICAL CALCULATOR

ANTIQUE MATHEMATICAL CALCULATOR

Item Description:

ANTIQUE MATHEMATICAL CALCULATOR - "Thacher's Calculating Instrument" Cylidrical Rule Model 4012, made by Keuffel and Esser of Hoboken, NJ. from an 1881 patent. This model dates to cairca 1910. The cylinder 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 were also included. Instructions mounted on base. Housed in the original mahogany box. 6" x 24" x 7". Water damage to box, spotting to calculator.

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$ 225.00 ( Sold Price )
THIS ITEM HAS RECENTLY BEEN SOLD

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Listed price: $400.00
 

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ANTIQUE MATHEMATICAL CALCULATOR

Listed price: $400.00
 

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