<P> Surviving notes from Wilhelm Schickard in 1623 reveal that he designed and had built the earliest of the modern attempts at mechanizing calculation . His machine was composed of two sets of technologies : first an abacus made of Napier 's bones , to simplify multiplications and divisions first described six years earlier in 1617 , and for the mechanical part , it had a dialed pedometer to perform additions and subtractions . A study of the surviving notes shows a machine that would have jammed after a few entries on the same dial , and that it could be damaged if a carry had to be propagated over a few digits ( like adding 1 to 999 ) . Schickard abandoned his project in 1624 and never mentioned it again until his death eleven years later in 1635 . </P>
<P> Surviving notes from Wilhelm Schickard in 1623 reveal that he designed and had built the earliest of the modern attempts at mechanizing calculation . His machine was composed of two sets of technologies : first an abacus made of Napier 's bones , to simplify multiplications and divisions first described six years earlier in 1617 , and for the mechanical part , it had a dialed pedometer to perform additions and subtractions . A study of the surviving notes shows a machine that would have jammed after a few entries on the same dial , and that it could be damaged if a carry had to be propagated over a few digits ( like adding 1 to 999 ) . Schickard abandoned his project in 1624 and never mentioned it again until his death eleven years later in 1635 . </P>
who invented the first gear driven calculating machine
who invented the first gear driven calculating machine
Wilhelm Schickard
Wilhelm Schickard