The Arithmometers of Thomas de Colmar & Payen

© Valéry Monnier 2018

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The 1850s ... Promoting his arithmometer
with "very royal" gifts

VIPs who received an arithmometer as a gift
A nice example: Count of Trapani's arithmometer (© Serge Roubé)

Drawings of the arithmometer throughout the years

Discover in a few minutes
Discovery of a new prototype !!

1 » What is an arithmometer
2 » How is it working
3 » See videos

Demonstration models
How many has survived ?
Sn 1316 modified
The mystery of Serial numbers
Instruction manuals
Videos & Simulations

How the arithmometer works : Video-modelisation by Michael L. Hilton (10mn)

T1820 project
Project 1820
Modelisation with Catia is also:

A true digital library !
Data base !
Arithmomètre Thomas de Colmar
Anatomy section !
What about the models !
Long live the museums !
Thomas de Colmar


The arithmometer N°541 for Mlle Renaud
A forced marriage ?


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© Valéry Monnier

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