Uploaded January 2023 | Updated September 2026, 4 hours ago

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The Kuhrt calculator has a unique mechanism using pinwheels with sideways shifting pins. It was made in Leipzig, Germany between 1924 and 1927, and is very rare. Only about 2500 machines were made.

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

0:00 Introduction
0:57 History
2:43 Addition/Subtraction
3:43 Multiplication
4:25 Clearing input
5:04 Clearing register
5:35 Overflow bell
6:04 Mechanism
8:36 More history
10:13 Outro