April 24, 2024
Antique Keuffel & Esser , Thacher's Calculating Instrument
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Thacher's Calculating InstrumentThe ultimate cylindrical slide rule, invented by EdwinThacher and patented in 1881. Thacher had the scales divided by W.F. Stanley,in London. However, by 1897, Keuffel & Esser had taken over production. Theend of the slide on this example is marked " Patented by Edwin Thatcher,C.E., Nov 1st, 1881 " Made by Keuffel & Esser Co., New York "and " Divided by W.F. Stanley, London, 1882 ". The serial numberstamped on the wood base of the instrument and on the K&E label inside thebox lid is 4286. The instruction booklet accompanying the instrument is dated1917. The 74 pp book was written and first copywrited by Edwin Thacher in 1884.The instrument is in very good condition, with norepairs. There is normal aging of the scales. The manual is complete and in good condition.
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