Uploaded May 2025 | Updated September 2026, 3 hours ago

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This is the first version of the Comptometer, which has a wooden casing. It was in production from 1888 to 1903. From the serial number it is likely that mine was made in 1902 or 1903. Only about 6300 were made.

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

0:00 Introduction
0:48 Addition
1:29 Mechanism
2:12 Carry suppression
2:50 Carry mechanism
3:25 Improved carry mechanism
5:14 Clearing mechanism
5:30 Demo
6:26 Outro