F.90 Data Sheet MJS-p-0226

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Felsenthal, Logarithmic Calculator FF-6, 1951

Serial Number or Date Stamp:

Country: USA

Primary construction material: pl

Case included?: yes

General Description: Basic circular polyphase slide rule

Length of 1 decade = 12 in, and overall scale length = 12 in. The largest physical dimension is 5 in.

Front Scales: T D [ C CI L frac ]

Back Scales: S A [ B K DA CmplAng ]

Notes: G. Felsenthal & Sons, Chicago; instructions and paper pouch

References: https://www.madeinchicagomuseum.com/single-post/g-felsenthal/

Date Acquired: 11/06/2021