Richardson, Direct Reading (812), c.1912
Serial Number or Date Stamp:
|Country: USA||Primary construction material: Al||Case included?: yes|
General Description: Basic linear Mannheim slide rule
Length of 1 decade = 10 in, and overall scale length = 10 in. The largest physical dimension is 10 in.
Front Scales: S A [ B C ] D T L
Notes: Nice condition; early rule
Date Acquired: 11/26/2018