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The Comptometer (7 h 50 min, 18 nov 2018 ans – 20 h 53 min, 30 juill. 2019 ans)

Description:

The Comptometer was introduced in 1885, and it was the first mechanical calculator in which numbers were entered/processed by pressing keys. Making the operation of the machine easier.

Instead of having 10 keys for the numbers from 0 to 9, they had columns of 10 keys each, introducing successively . The most powerful calculators had up to 20 columns in their full keyboards.

Ajouté au bande de temps:

Date:

7 h 50 min, 18 nov 2018 ans
20 h 53 min, 30 juill. 2019 ans
~ 8 months