The Marchant ACT-10M mechanical calculator
Channel: Jaap Scherphuis
Date: 2021-02-16

The Marchant ACT-10M was made between 1942 and 1948, though mine is likely to be one of the later ones. It uses a proportional gear mechanism which was the fastest general calculation method until electronics came along. In this video I show what all its buttons and switches do.

Other related videos:
The STOP button of the Marchant ACT-10M calculator: https://youtu.be/oeeHAUdeQRY
Marchant ACT-10M doing division in slow motion: https://youtu.be/imGteh7YUGY
The Marchant XL: https://youtu.be/ewLT2s4THG0

For more information about this machine and other calculators in my collection, please visit my site:
https://www.jaapsch.net/mechcalc/

0:00 Introduction
0:40 Addition
1:09 Subtraction
1:40 Clearing
2:22 Multiplication
4:26 Tabulation
6:05 Division
8:25 Stopping division
9:07 Reverse button
10:01 Outro