Uploaded December 2017 | Updated September 2026, 4 hours ago

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A demonstration of the Direct II, which is a mechanical calculator made in Switzerland between the late 1920s till at least 1940.

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

0:00 Introduction, history
0:53 Addition
1:18 Totals
1:59 Subtraction
2:24 Clearing
2:51 Multiplication
3:57 Correction
4:35 Outro