Thatcher's Calculating Instrument by Keuffel & Esser Co., New York, No. 4012, Serial No. 4722, with inner sliding cylinder and outer twenty-bar rotating "envelope" with printed scales, on mahogany base with instruction label, wd. 21 1/2 in., direction booklet by Edwin Thatcher, and mahogany case with celluloid plaque Keuffel & Esser Co., Drawing Materials, Surveying Instruments, Measuring Tapes.
Thatcher's Calculating Instrument by Keuffel & Esser Co., New York, No. 4012, Serial No. 4722, with inner sliding cylinder and outer twenty-bar rotating "envelope" with printed scales, on mahogany base with instruction label, wd. 21 1/2 in., direction booklet by Edwin Thatcher, and mahogany case with celluloid plaque Keuffel & Esser Co., Drawing Materials, Surveying Instruments, Measuring Tapes.
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.jpg "Source: Christie's")
.jpg "Source: Christie's")
