How the Comptometer Works
A visual explanation of how the Comptometer, the first practical key-driven calculator, works. Comptometers were manufactured continuously from 1887 until the 1970s. The specific details described in this video are for a Model F Comptometer, built around 1915.

▶︎
A demo of Charles Babbage's Difference Engine

▶︎
The Curta Calculator: A Mechanical Marvel Explained | Part 1

▶︎
How the CURTA Works

▶︎
Inside a mechanical calculator

▶︎
Facit ESA-0 - Care & Cleaning

▶︎
Facit ESA-0: How to use

▶︎
Magic Brain: Last Gasp of the Mechanical Calculator

▶︎
Explaining the Friden Mechanical Calculator (while fixing it)

▶︎
False Dawn: The Babbage Engine

▶︎
Divide by Zero on the Friden STW10 Mechanical Calculator

▶︎
The Professor Who Taught People How To Think (1962)

▶︎
Mechanisms EVERY Mechanical Engineer Should Know

▶︎
It finds the derivative: The Ott Derivimeter (1930s)

▶︎
The Mechanical Integrator - a machine that does calculus

▶︎
Mechanical calculator in action

▶︎
How Pinwheel Calculators Work

▶︎
Comptometer Model F Adding Machine Review / HowTo

▶︎
How to use a Comptometer mechanical calculator

▶︎
How a Mechanical Typewriter Works

▶︎
