F.381 Data Sheet MJS-p-0419

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Richardson, Direct Reading Slide Rule, 1910

Serial Number or Date Stamp:

Country: USA

Primary construction material: Al

Case included?: no

General Description: Basic linear Mannheim slide rule

Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.

Front Scales: A [ B C ] D

Back Scales:

Notes: very early rule; celluloid slide; early cursor with glass and 2 hairlines; PAT APPLD FOR on cursor only; no patent info on rule itself

References: https://sliderulemuseum.com/Richardson.htm

Date Acquired: 04/28/2026