The Madas Portable 12e mechanical calculator
Channel: Jaap Scherphuis
Date: 2021-05-30

The Madas Portable 12e is a mechanical calculator made by H. W. Egli in Switzerland from 1931. Versions of this machine were made until the late 1960s. This is the simplest electric model, and most later machines were much more automated. Even though this model is electric, shifting the carriage is still done manually. For this reason it has no fully automatic division

For more information on this and other machines in my collection, please visit my website:
https://www.jaapsch.net/mechcalc/

0:00 History
1:50 Addition
2:24 Subtraction
2:42 Clearing
2:49 Multiplication
4:32 Division
6:53 Manual crank
7:32 Removing carriage
8:08 Serial number
8:34 Outro