differentiate between simple mechanical calculator/ pascal calculator and modern age computers
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Answer:
the pascaline (or roue paschaline, as it is called in 17th century) of the great french scientist blaise pascal was for long time considered as the first mechanical calculator in the world, as the rechenuhr of schickard was not widely known until 1950s. pascal had no access to the correspondence of kepler, so he is hardly likely to know anything about schickard. it is more likely pascal to have read the annus positionum mathematicarum, or problemata (courses covering geometry, arithmetic and optics) of dutch jesuit-mathematician jan ciermans (1602-1648), who mentioned in his courses, that there is a method with rotuli (normally rolls of parchment for writing upon, but could also intend the more modern diminutive for rota i.e. little wheels) with pointers, which enables multiplication and division to be done with a little twist, so the calculation is shown without error.