Slide rules HOME page COLLECTION 10" RULES U.S.A.
Make Richardson, USA

1. This rule is made of tin plate.
2. The provisional patent is dated to 1917 by P Hopp. This would suggest that it is of a similar age to the unnamed British tin plate rule.
3. The cursor is missing.

Front view
1043-richardson-1776-01.jpg (28478 bytes)
Detail - front left
1043-richardson-1776-02.jpg (33331 bytes)
Manufacturing date c 1920
Length 10"
Material Tin plate
Scales K, S,  A[B, CI, C] D, T, L
Cursor Missing
Hair lines None
Documentation None
Condition Good condition if a bit dirty.