The sector, a calculating instrument used for solving problems in proportion, trigonometry, multiplication and division, and for various functions, such as squares and cube roots, was developed in the late 16th century and found application in gunnery, surveying and navigation.The planimeter was a manual instrument to calculate the area of a closed figure by tracing over it with a mechanical linkage.
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The Internet is run on computers and it connects millions of other computers.
Since ancient times, simple manual devices like the abacus aided people in doing calculations.
Since then, many other forms of reckoning boards or tables have been invented.
In a medieval European counting house, a checkered cloth would be placed on a table, and markers moved around on it according to certain rules, as an aid to calculating sums of money.
Such computers are used as control systems for a very wide variety of industrial and consumer devices.