F.391 Data Sheet MJS-p-0444

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Richardson, Direct Reading, 1911

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: 1911 type rule, with celluloid on curved Al slide; 1911 cursor; 1911 patent on body; a thank you goes out to MikeF

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

Date Acquired: 09/21/2026