Slide rules HOME page COLLECTION 10" RULES UNITED KINGDOM
Make Dargue, United Kingdom
Model Simplon - SR10 - Bilateral
Notes
1. It is interesting to compare this rule with the Simplon Major  from the same maker which tackles similar problems in very different ways.
2. This rule has scales on both faces of the stock and a reversible cursor. However if it is required to, say, include the sine of a number in other calculations it is necessary to write it down and perform the calculation using the scales on the other face.

Front view
1020-simplon-bilateral-01.jpg (27053 bytes)

Back view
1020-simplon-bilateral-02.jpg (25617 bytes)

Detail - front view
1020-simplon-bilateral-03.jpg (29341 bytes)

Detail - back view
1020-simplon-bilateral-04.jpg (17988 bytes)
Manufacturing date c 1945
Length 10"
Material Plastic on wood
Scales K, A [B, C] D, L \ A,S,L,T,D
On the rule these scales are named D3, A1 [B1, C1] D1, L \ A,Sine,Log,Tan,D
Gauge points p: 3.14: A,B,C,D
r' : 3438 : C,D
r" : 206255 : C,D
c : 1.13: C,D
c': 3.57: C,D
r11: 6.37:C,D
M: 31.8: A,B
Cursor Plastic (reversible)
Hair lines