Halden Calculex
physical object
Identifier
2024.39.9
Description
The Halden Calculex is a circular slide rule made by J. Halden & Co., LTD., circa 1910. It is accompanied by a "Rules Tables and Formulae" book that describes it as "for the use of engineers, architects, surveyors, manufacturers, mill owners, timber merchants, builders, mechanics, and all business men, &c."
Related Term
Slide Rules (describes)
