Directions for Using Thatcher's Calculating Instrument
text
Identifier
2024.39.34
Description
Booklet with directions for using Thatcher's Calculating Instrument, made by Keuffel & Esser Co. Published in 1914. Copyright 1884, by Edwin Thatcher and 1903, 1907, 1910, 1914 by Keuffel & Esser Co.
Related Term
Slide Rules (describes)
