Scientific Instruments > Calculating

Faber Castell 1/98 Elektro Slide Rule.

Item#: SCI431

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This is a Faber-Castell 10 inch slide rule from the 1960’s. Made of wood laminated with plastic with a Perspex wrap-around cursor with 5 hairlines. The scales on the front of the ruler are: LL2, A (kw) [B, C1, C ] D, LL3 and L . There is a 27 cm scale on top in the beveled edge. An unusual feature is the presence of Dynamo and Volt scales in the well of the stock whose values were read by a small metal tongue. This feature was used exclusively for electrical rules to calculate efficiency of motors and dynamos and voltage loss. On the back are conversion tables in German. Complete with original two-part trademark green pasteboard case inscribed Faber Castell and Castell Elektro 1/98.