The mechanism of the Archimedes Model D mechanical calculator @jaapsch2

Uploaded December 2019 | Updated September 2026, 2 days ago

Here I show the mechanism of the Archimedes mechanical calculator.

Here is the main video about the Archimedes:
youtu.be/HQ0pgokbdrY

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

0:00 Introduction
0:12 Carriage, register
1:22 Actuator mechanism
2:31 Carry mechanism
4:22 Keyboard mechanism
5:34 Stepped drums
7:53 Outro

The mechanism of the Archimedes Model D mechanical calculator

The Technidyne Micro-Tally adding machine

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$The Quixsum Fractional Adding Machine The Quixsum Fractional Adding Machine is an adding machine for lengths in feet, inches, and fractions of an inch. It was made in 1924. It is very rare as only about 600 were ever made. Stephen Freeborn has a nice video of it too: https://youtu.be/7f4Q-YwIhKw For more information about this and other machines in my collection, please visit my website: https://www.jaapsch.net/mechcalc/ 0:00 Introduction 0:12 History 1:19 Adding 4:04 Clearing 5:02 Opening case 5:02 Opening case 5:33 Mechanism 6:57 Rarity 7:57 Outro$