F.380 Data Sheet MJS-p-0423

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Richardson, Direct Reading Pocket, 1912

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 = 5 in, and overall scale length = 5 in. The largest physical dimension is 5 in.

Front Scales: A [ B C ] D

Back Scales:

Notes: pocket rule; metal cursor w/ 1 hairline; metal slide; 1911, 1912 patents

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

Date Acquired: 04/28/2026