Thatcher's Calculating Instrument, by Keuffel & Esser Co., New York, No. 4012 / 4142, patd. by Edwin Thatcher 1881, with outer paper-covered scales on revolving brass rings, and 19-inch sliding inner cylinder, on mahogany base with paper instruction label, lg. 21 1/2 in., in mahogany case.
Thatcher's Calculating Instrument, by Keuffel & Esser Co., New York, No. 4012 / 4142, patd. by Edwin Thatcher 1881, with outer paper-covered scales on revolving brass rings, and 19-inch sliding inner cylinder, on mahogany base with paper instruction label, lg. 21 1/2 in., in mahogany case.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
