F.121 Data Sheet MJS-p-0441

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Hemmi, 152, 1925-1932

Serial Number or Date Stamp:

Country: JPN

Primary construction material: bb

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: K A [ B CI C ] D T

Back Scales: theta Rtheta P [ Q Q’ C ] LL3 LL2 LL1

Notes: Electrical Engineer’s Universal (Duplex); US Pat 1459857, issued to O D Parsons in 1923 for P, Q scales; no model number; sarif font

References: https://sliderulemuseum.com/srtco/HemmiCat1.shtml

Date Acquired: 08/29/2026