How Pinwheel Calculators Work

A visual explanation of

I'll show and describe how an Odhner

Unlike the last video, the subject of this one is significantly more divisive.

The Thales model A is an early mechanical

The 1954 machine Hamann 300 (so called version A) - semi automatic " ratchet"

Calculating

This video shows a Facit NEA2 electro-mechanical

In this video I show how to use a Odhner mechanical

You can find part one at: https://www.youtube.com/watch?v=i20hnOFpyCg Often incorrectly referred to as

Can you guess what this strange contraption is for? It's a

In 1875 Willgodt Odhner made the

Automatic division on a Brunsviga 11S mechanical

In this Retro Tech / Vintage Tech video we're taking a look at a Muldivo Mentor

My mechanical

A demonstration of The Original Odhner - a mechanical

Multiplication and division on a Friden 1217 printing

This video describes in detail how the CURTA Type I

The Precisa 117 is a

I had this in my family since I was a kid. More info: http://en.wikipedia.org/wiki/Odhner_Arithmometer.

Here I show a Marchant Pony A (sn: 04046) and a Marchant Pony Special A (sn: 60246)