Uploaded June 2021 | Updated September 2026, 1 hour ago

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The Calculator adding machine was made between 1915 and 1922, at which point it was replaced by the Lightning Calculator. It is almost identical to the Bonham & Schram calculator from 1905.

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

0:00 History
1:02 Stand and stylus
1:18 How to use
2:50 Stand and stylus
3:35 Further history
4:02 Outro