Title: Thacher''s Calculating Instrument, or Cylindrical Slide-Rule: Containing Complete and Simple Rules and Directions for Performing the Greatest Variety of Useful Calculations With Unexampled Rapidity and Accuracy (Classic Reprint)
Publisher: Forgotten Books
Publication Date: 2018
Language: English
ISBN 10: 0282650334
ISBN 13: 9780282650339
Binding: PAP
Condition: New
Weight: 168 grams

About this title

Synopsis

This book introduces a mechanical slide rule, an invention predating the electronic calculator and computer, which provides rapid and accurate calculation or rough checking of ordinary calculations. It was initially designed for use by engineers, architects and actuaries, but its usefulness extends to scientific investigations and financial transactions. The author explains that the slide rule's main benefit is that the accuracy of its results is dependent on the length and manufacture of its scales and the material used, which is usually boxwood. The accuracy of ordinary slide rules made from inferior materials, such as boxwood, is limited to three places, which may often be in doubt due to the unequal shrinkage of the material. In contrast, the scales in this instrument are of great length and are printed directly from machine-divided plates containing over a thousand divisions, each of which has been checked for error and temperature variation. The author also emphasizes that the instrument is made of metal throughout, protecting it from temperature and moisture variations. The text thoroughly describes the construction and principles of operation of the slide rule, making it accessible to a wide range of users with varying levels of mathematical knowledge and experience.

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