F.30 Data Sheet MJS-p-0149

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Charvoz-Roos, Power Trig, c.1945

Serial Number or Date Stamp:

Country: USA

Primary construction material: wd

Case included?: yes

General Description: Advanced linear log-log trig/decitrig 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: Post 1462; brown leather case

References: http://www.oughtred.org/jos/articles/V09.2_p37-46.pdf

Date Acquired: 08/19/2020