Uploaded March 2023 | Updated September 2026, 1 hour ago

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The Monroe model K mechanical calculator was made from 1921 till 1929. In this video I show it with the casing removed, giving you a good look at its mechanism.

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

0:00 Multiplication
0:27 Keyboard
0:38 Crank
1:24 Removing carriage
2:13 Carry mechanism
3:31 Stepped drums
5:07 Counter
5:30 Carriage shift
5:41 Overflow bell