Dating faber-castell slide rules - Suggestions for Dating pre-1920 Faber-Castell Slide Rules


5. In the same book Pickworth also says that in some rules the runner consists of "chisel-like projections" but the rule has a preferred form of runner with glass in a metal frame. This rule has a cursor (. runner) with both glass and chisel-like projections. The rule described by Pickworth also has trigonometry scales on the back of the slide which this rule does not.


Dating faber-castell slide rules

Dating faber-castell slide rules



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