Philipp Matthäus Hahn calculator 1770 1774, demonstration model @MarkFrankclocks
Philipp Matthäus Hahn calculator 1770 1774, demonstration model @MarkFrankclocks
Uploaded October 2024 | Updated September 2026, 2 weeks ago
Demonstration model of Philpp Matthäus Hahn's calculator. This video shows how addition and multiplication is performed. For more information about this type of calculator: my-time-machines.net/hahn%20model.htm.
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Philipp Matthäus Hahn calculator 1770 1774, demonstration model

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