Since early days mankind has been looking for improving the Mathematical
calculations bothersome processes. Thus, the abacus was one of the
first instruments used for quick Mathematical calculations, originally
invented in China circa 3000 B.C. Such a calculating device was
used for arithmetical processes often constructed as a wooden frame
with beads sliding on wires.
Therefore the first concepts for building mechanical calculators
appeared around the XVI century only. Fig. 353.

Fig. 353  The abacus invented in China circa
3000 B.C. 
