Inside A Mechanical Calculator

All right so this is the

The 1954

This is how the Friden STW-10 handles 12345 ÷ 0. This

Multiplication and division on a Friden 1217 printing

I've always wanted to create this explainer since I first discovered the Curta

How and why I built a

Repairing a Schubert DRV

The Precisa 117 is a pinwheel

In December 2014 I made six short videos. This is one of them. It features the Curta Model 1

My

A visual explanation of how pinwheel

A

Automatic division on a Brunsviga 11S