FUNDAMENTALS OF COMPUTER

Detailed explanation-1: -Calculating Clock, the earliest known calculator, built in 1623 by the German astronomer and mathematician Wilhelm Schickard.

Detailed explanation-2: -Inventor: Wilhelm Schickard Schickard’s “Calculating Clock” is composed of a multiplying device, a mechanism for recording intermediate results, and a 6-digit decimal adding device.

Detailed explanation-3: -Quick Info. Wilhelm Schickard was a German astronomer who invented a calculating machine long before Pascal. He worked on astronomy, mathematics and surveying.

Detailed explanation-4: -The machine could add and subtract six-digit numbers, and indicated an overflow of this capacity by ringing a bell; to add more complex calculations, a set of Napier’s bones were mounted on it. Schickard’s letters mention that the original machine was destroyed in a fire while still incomplete.

Detailed explanation-5: -Schickards’s Calculator Schickard combined Napier’s Bones, for multiplication and division, with a toothed-wheel system to add and subtract. It is the earliest known mechanical four-function calculator.