F.375 Data Sheet MJS-p-0426

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Richardson, 812, c.1922

Serial Number or Date Stamp:

Country: USA

Primary construction material: ss

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: S A [ B C ] D T L

Back Scales:

Notes: Model 812; nice condition; Richardson Rule Works; Technical Supply Company on slide

References: https://www.sliderulemuseum.com/Richardson.htm; JOS V28.1 p11

Date Acquired: 05/20/2026