Circular Slide Rules & Calculators

Fowler's Universal Calculator

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FowlerUniversal

This is a single-sided calculator 3.3" dia (84mm). Supplied in a brown leather case. There are seven separate scales. Beginning with the largest in diameter, No.1, and proceeding inward.

The scale length is 19", as compared with an ordinary 10" slide rule. It permits calculations being made to three, and sometimes four significant figures.