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 

Back view 

Detail  front view 
Detail  back view 
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 D^{3}, 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 r_{11}: 6.37:C,D M: 31.8: A,B 
Cursor  Plastic (reversible) 
Hair lines 