Slide Rule SIMPLON
A cardboard box with a 12″ SIMPLON MAJOR Log Log wooden and celluloid slide rule
Front Scale
LU, A [ B, C ] D, LL
Back
Conversion Chart
Slide NOT reversible
This Simplon slide rule is held together with steel springs which cannot break away with ordinary use. The main stock of the rule is in two parts, the woodwork being separated at the centre to enable the springs to function properly. This is as it should be and follows the principle of the World’s best slide rules.
Patent No 413308
Period
1930’s
Origin
Made in England
Condition
The celluloid is discoloured and warped on the edges.
Size Boxed
346mm 
55mm 
18m
Weight
146g(Not including packing)
