F.385 Data Sheet MJS-p-0440

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Richardson, 1860 LL, c.1917

Serial Number or Date Stamp:

Country: USA

Primary construction material: ss

Case included?: no

General Description: Advanced linear log-log polyphase trig/decitrig slide rule

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

Front Scales: K S A [ C LL1 LL2 LL3 ] D T L

Back Scales:

Notes: Log-Log scales on slide; Pantocrat system; also with second, standard slide = [ B CI C ]

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

Date Acquired: 08/05/2026