The mechanical calculator (7 h 50 min, 18 nov 2018 ans – 20 h 53 min, 30 juill. 2019 ans)
Description:
The mechanical calculator then invented by Thomas de Colmar in the mid-nineteenth century, and subsequent others. It was called the Arithmometer. The concept was improved with pinwheel calculators invented by Baldwin and Odhner.Ajouté au bande de temps:
Date:
7 h 50 min, 18 nov 2018 ans
20 h 53 min, 30 juill. 2019 ans
~ 8 months
