F.33 Data Sheet MJS-p-0079

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Charvoz-Roos, SR-109, c.1941

Serial Number or Date Stamp:

Country: USA

Primary construction material: wd

Case included?: yes

General Description: Advanced linear log-log duplex slide rule

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

Front Scales: T DF [ CF CIF CI C ] D S ST

Back Scales: LL0 LL00 A [ B K L C ] LL3 LL2 LL1

Notes: Made in U.S.A.; no company ID; case (Tom Walsh); nice and precise

References: https://www.sliderulemuseum.com/CharvozRoos.htm; https://www.sliderulemuseum.com/MiscUSA/Charvoz-Roos_SR-109_DavidHecht-030.jpg

Date Acquired: 08/01/2020