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CONTROLLER 75 R ( Diameter = 75 mm )
CONTROLLER - CALCULATOR, Muenchen / Germany (1962)
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S C A L E S of the CIRCULAR SLIDE RULE »CONTROLLER« Model 75 R
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( one-sided only )
X outer circle
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X inner circles
1/X
X2
R E M A R K : Same as Model 110 R - only smaller:
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This circular SR came in a green plastic case with an instruction
booklet. On the back side of the CONTROLLER is a conversion table
and a table with physical constants printed ...
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... and rolled, it measures the LENGTH of a CURVE in [ cm ]