GrumpyTim | Retro Tech - Muldivo Mentor Pinwheel Calculator - Part Two - Demonstration @GrumpyTim | Uploaded 4 years ago | Updated 2 hours ago
In this Retro Tech / Vintage Tech video we're taking a look at a Muldivo Mentor pinwheel calculator, made in the 1950s or 1960s. This calculator is actually a WSR160 made by Walther in Germany - it was sold in the UK by "The Muldivo Calculating Machine Company Ltd" and badged as a Muldivo Mentor.

This video is part two of 2. In part one we show the restoration of the machine - you can see part one here:
youtu.be/1YRs0tJ1AJw

In this video we demonstrate how to use this calculator (and most other pinwheel calculators are pretty similar). We cover addition, subtraction, division, multiplication, decimal points, cubing using the back transfer mechanism and even struggle to calculate the square root of 2. We also show how the machine works inside.

Chapters:
Start 00:00
Addition and Subtraction 00:48
Multiplication 03:00
Division 06:45
Cubing 09:55
Square Root 12:00
Inside the Machine 17:25


Intro Music
"As Yet Untitled"
by GrumpyTim (available to download from GrumpyTim's Bandcamp page)
grumpytim.bandcamp.com

http://www.grumpytim.com