Sheobox Comptometers - Links
James Redin's Dotpoint calculator site is a virtual cornucopia of historical and technical information about all manner of calculators including several pages devoted to Ray Mackay's dissertations on the operation, care and repair of these dear old throwbacks.
For a description of the mechanism of models F thru WM, click here The war model (WM) was a variation on the M-model to conserve metal during WWII. With words and jpgs, Ray gives a step by step teardown of the internals.
Erez Kaplan has created a working Comptometer demonstration right here on the Internet. While it does not premit multiple, simultaneous fingering (would need multiple mice for that :-), its certainly fun to operate.
Return to Comptometers Home Page