Slide rule and calculation monographs.
Williams, Bruce O. B.Check figures a once ubiquitous tool for book-keepers.
Knott, John V.United Kingdom patent system and selected slide rule patents from 1735 to 1920.
Barnes, Colin A.
U.K. Slide Rule Circle.
Ely : Colin Barnes in conjunction with the U.K. Slide Rule Circle,
c2002.
Includes bibliographical references.
no. 1. United Kingdom patent system and selected slide rule patents from 1735 to 1920 / John V. Knott -- no. 2. Check figures: a once ubiquitous tool for book-keepers / by Bruce O.B. Williams.
Slide-rule