Thacher's Calculating Instrument, Keuffel & Esser Co., no. 4013, serial no. 5188, c. 1920, consisting of a cylindrical slide with both rotary and longitudinal movement, two logarithmic scales reading from 100 to 1000, and magnifier rides along the triangular bar, mounted to a mahogany base, housed in its original finger-jointed mahogany box, with the original manual, instrument lg. 21 1/2 in.
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