F.77 Data Sheet MJS-p-0211

Fearns Calculators, A13, c.1970

Serial Number or Date Stamp:

Country: UK Primary construction material: pl Case included?: yes

General Description: Advanced circular log-log slide rule

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

Front Scales: K D [ C B ] A LL S T

Back Scales:

Notes: Log-Log is single helical 3-turn scale; made for Industrial Scientific Instruments, Montreal; conversion factors on back

References: https://sliderules.nl/mysliderules/detail/fearns-calculator-a13

Date Acquired: 08/27/2021