The materials in this section are divided in chronological order.

In the subsection Pioneers are described projects for first mechanical calculators, up to the end of the 17th century, which were created by some of the most famous polymaths and encyclopedic scientists of their time—Leonardo da Vinci, Wilhelm Schickard, Blaise Pascal, Gottfried Leibniz...

In the next 3 subsections is traced the slow and sure development of the mechanical calculating devices in the 18th century, the transformation of the craft and hobby of making calculating devices into an industry in the 19th century, the flourishing and the gradually decreasing of the importance of these machines in the age of electronics—20th century.

Quite a few less known, simpler and not so important calculating machines are examined in the section Gadgets.

Everything should be made as simple as possible, but not one bit simpler.
Albert Einstein (1879–1955)