It was a manually-operated calculating device which was invented by John Napier (1550-1617) of Merchiston. An image of this tool is shown below Napier's Bones Abacus is still used in some countries like China, Russia and Japan. The beads were moved by the abacus operator according to some rules to perform arithmetic calculations. It was a wooden rack which has metal rods with beads mounted on them. It is said that Chinese invented Abacus around 4,000 years ago. The history of computer begins with the birth of abacus which is believed to be the first computer. Some of the popular computing devices starting with the first to recent ones are described below Abacus As human mind and technology improved with time more computing devices were developed.
They used sticks, stones and bones as counting tools.
The first counting device was used by the primitive people.
