Uploaded May 2021 | Updated September 2026, 2 hours ago
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:
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
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:
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
