l'Abaque rhabdologique de Claude Perrault (1666) / the adding machine of Claude Perrault (1666)

Claude Perrault is probably the inventor of the first "pocket" adding machine with automatic carry-over mechanism. Some years after Pascal (1643), and some years before Leibniz (1694), Perrault's adder, built circa 1666 is a very important device for the history of sciences. A replica has been made to show how it works. / Valéry Monnier (www.arithmometre.org, www.ami19.org)

[@javiersilvaceron1235]

Muchas gracias por compartir tus conocimientos.

[@valerymonnier3184]

Ola Javier, gracias !! Valéry

[@ftey2000]

belle reproduction. Ce genre d'additioneur était toujours utilisé jusque dans les années 30-40..J'en ai collectionné pas mal..

[@showmatemagico]

Você tem algum modelo para construir uma dessas?