This calculator was manufactured in Germany and is based upon a chain mechanism with a slider for each integer column, the sliders being pulled by means of a stylus. Tens carry automatically. The result register can be cleared by means of the crank lever on the side, top right. Subtraction is achieved by addition of the complementary numbers.

The A lever sets the machine for addition by erasing the last result whilst the M setting locks the current number in place so that it can be added to itself.

There were three models produced of which this is the smaller (9 column) version. A sliding vertical bar which allows the columns of the result register to be lined up with the corresponding chain on the input panel appears to have gone missing.

Pages linked to this page

Creative Commons License This work by Jim Falk is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License Click on the logo to the left to see the terms on which you can use it.

Page last modified on 24 September 2015