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
Notes: Log-Log is single helical 3-turn scale; made for Industrial Scientific Instruments, Montreal; conversion factors on back
Date Acquired: 08/27/2021