The Madas BZS mechanical calculator
Channel: Jaap Scherphuis
Date: 2021-05-22

The Madas BZS is a mechanical calculator made by H. W. Egli in Switzerland. The first version of the Madas Portable is from 1931, but this fully automatic one is from about 1960.  It has fully automatic division and multiplication. Note however that I have not been able to get the multiplication working, as it seems that some parts deep inside are stuck together and I have not yet dared to take it apart far enough to reach those parts.

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

0:00 Introduction
0:16 Addition
0:41 Subtraction
1:03 Semi-automatic multiplication
2:04 Clearing
2:22 Division
3:42 Tabulation
4:55 Aborting division
6:25 Counter direction
7:00 Setting multiplier
8:06 Automatic multiplication
9:12 Carry mechanism
10:24 Split register
11:10 Decimal markers
11:40 Outro