Thatcher's Calculating Instrument
- Sold for:
- Clocks, Watches & Scientific Instruments - 2345
- Date / Time :
- July 29, 2006 10:00AM
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.