Uploaded December 2019 | Updated September 2026, 6 hours ago

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The Archimedes model D is a calculator modelled on the Arithmometer of Thomas de Colmar. It was made in Glashütte in Germany by Reinhold Pöthig, from about 1915 to 1928.

In a separate video I show the mechanism of this calculator:
youtu.be/TN-jltXqlq8

 For more information about this machine and others in my collection, visit my website:
jaapsch.net/mechcalc

0:00 Introduction, history
1:59 Serial number
2:35 Addition
3:42 Subtraction
4:22 Automatic keyboard clearing
4:36 Clearing register
4:58 Multiplication
6:13 Division
9:48 Model variations
10:36 Further history
13:16 Outro