Thatcher's Calculating Instrument
physical object
Identifier
2024.39.33
Description
Thatcher's Calculating Instrument is a cylindrical slide rule, created by Edwin Thatcher and patented in 1881. This model is made by Keuffel & Esser Co. circa 1914. It is accompanied by a wooden carrying case and magnifying glass.
Related Term
Slide Rules (is described by)
