Uploaded November 2017 | Updated September 2026, 1 hour ago

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The Thales KA is an adding machine with a rather unique mechanism. It was made in Germany from 1953 to 1963, and this one is probably from about 1960.

For more information on this an other mechanical calculators in my collection, visit my website:
jaapsch.net/mechcalc

0:00 Introduction, history
0:50 Keyboard
1:12 Addition
2:15 Clearing
2:41 Multiplication
3:14 Subtraction
4:08 Early variants
4:48 Outro