Category:Thomas arithmometer

This category lists the [Mecanical calculators] invented by Charles-Xavier Thomas, de Colmar, also known as Thomas de Colmar. First patent in 1820. He also invented the name "Arithmomètre". This name became a generic name for some decades. See also Payen arithmometer for similar machines made by his mechanics after his death.


This category has only the following subcategory.

Media in category "Thomas arithmometer"

The following 21 files are in this category, out of 21 total.