Napier's bones (jan 1, 1617 – 20h 53min, jul 30, 2019 y)
Description:
Napier's bones are a manually-operated calculating device created by John Napier of Merchiston, Scotland for calculation of products and quotients of numbers. With a method based on lattice calculating. The rods looked like bones which is why it was called Napier’s bonesAdded to timeline:
Date:
jan 1, 1617
20h 53min, jul 30, 2019 y
~ 402 years