F.355 Data Sheet MJS-p-0185

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Thornton, P221, c.1967

Serial Number or Date Stamp:

Country: UK

Primary construction material: pl

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: S ST T A [ B L K C ] D DI Ps Pt

Back Scales: LL01 LL02 LL03 DF [ CF CI ISd ITd Td Sd C ] D LL3 LL2 LL1

Notes: British Thornton P221 Comprehensive; Ps, Pt, Td/Sd scales

References: https://sliderulemuseum.com/British/Thornton_P221_Duplex_LogLog_GiftOfJamesPennellCollection.jpg

Date Acquired: 03/24/2021