F.90 Data Sheet MJS-p-0151

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Festus, 50, 1938

Serial Number or Date Stamp:

Country: USA

Primary construction material: wd

Case included?: no

General Description: Basic linear beginner/student polyphase 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 CI C ] D K

Back Scales:

Notes: Festus Model 50; rough condition; magnifier cursor

References: https://www.sliderulemuseum.com/Acumath.htm; https://www.sliderulemuseum.com/isrm/acurule/,https://jeffcomohistory.org/LisasHistoryArticles/SlideRule.pdf

Date Acquired: 09/10/2020