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The mechanical calculator (7 ore 50 min, 18 nov 2018 anni – 20 ore 53 min, 30 lugl 2019 anni)

Descrizione:

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.

Aggiunto al nastro di tempo:

Counting/Caculating Inventions

ByEmily Stark
4 nov 2019

Data:

7 ore 50 min, 18 nov 2018 anni
20 ore 53 min, 30 lugl 2019 anni
~ 8 months
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