[ Home ]  [ Slide Rule Main ]
Created: 2002-07-12
Special Slide Rules
Otis King Calculator

Otis King, an England manufacturer, produced this cylindrical calculator. When collapsed, it measures only 15cm in length. It has equivalent of C and D scales spirally graduated on the cyrinder. The effective scale length is 168cm(66 inches) which gives one order of magnitude higher resolution than a 10" rule.

Faber Castell 67/87Rb

This pocket slide rule has adder/ subtractor, called "addiator", on back side. Who says the slider rules cannot do addition/ subtraction?

[ Home ]  [ Slide Rule Main