Question

Give the – classification of the mechanical calculating devices.

Answer 1

Mechanical Counting Devices - Abacus, Napier's Bones, Slide Rule

The abacus was one of the first adding machines. The abacus is made out of beads strung by several wires. The position of a bead determines its value.

John napier created a device using rods, called Napier's bones, to perform arithmetical calculations. These rods were widely used by accountants and bookkeepers.

Amedee Mannheim (1831-1906) who introduced the movable double sided cursor on the slide rule. With a modern slide rule you could not only perform the arithmetic operations, you could also calculate squares, square roots, logs, sine, cosine, and tangent calculations