Linear slide rules

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Faber decimal counter

A.W. Faber slide rule with decimal keeping cursor. The slide rule is made of wood with celluloid overlays. It is marked A.W. FABER MADE IN BAVARIA D.R.G.M 116832. (D.R.G.M. 116832 is the German Registered Design number given in 1899 for a cursor with indicator). The slide rule has 7 scales, as well as a centimeter and inch scales. The only scales that are labeled are on the back of the slider. They are: S, L, T. The case is marked A.W. FABER'S CALCULATING RULE LONDON and MADE IN BAVARIA.

D Scale length: 250 mm. Significant digits: 3 to 4.

Copyright 2012, Dave Hoyer.