F.90 Data Sheet MJS-p-0218

Festus, Acu-Rule 10D, 1938

Serial Number or Date Stamp:

Country: USA Primary construction material: wd Case included?: box

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: Nice early rule; paper scales on wood; good condition; magnifier cursor

References: https://sliderulemuseum.com/Acumath.htm, https://jeffcomohistory.org/LisasHistoryArticles/SlideRule.pdf

Date Acquired: 09/15/2021