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Rule Calculator
It is a calculation tool that acts as an analog computer . Numerical scales have several phones that facilitate quick and convenient execution of complex arithmetic operations , as may be multiplication, division , etc.
It was created by William Oughtred. -
Mechanic Calculator
It was a mechanical device used to perform automatically the basic operations of arithmetic. Most mechanical calculators were comparable in size to small desktop computers and have been rendered obsolete by the advent of the electronic calculator.
It was created by Pascal. -
Airthmometer
It was the first digital mechanical calculator strong enough and reliable enough to be used daily in an office environment. This calculator could add and subtract two numbers directly and could perform long multiplications and divisions effectively by using a movable accumulator for the result.
It was created by Thomas. -
Comptomometer
A key-driven calculator is extremely fast because each key adds or subtracts its value to the accumulator as soon as it is pressed and a skilled operator can enter all of the digits of a number simultaneously, using as many fingers as required, making them sometimes faster to use than electronic calculators.
It was created by Dorr E. Felt. -
Millionaire Calculator
It was the first commercially successful mechanical calculator that could perform a direct multiplication. It was in production from 1893 to 1935 with a total of about five thousand machines manufactured.
It was created by Egli. -
Electronic Calculator
Is a small, portable electronic device used to perform both basic operations of arithmetic and complex mathematical operations.
The first solid state electronic calculator was created in the 1960s, building on the extensive history of tools such as the abacus, and the mechanical calculator . It was developed in parallel with the analog computers of the day.
It was developed in parallel with the Analog computers. -
Calculator Watch
Is a digital watch with a built in calculator, usually including buttons on the watch face. Calculator watches were first introduced in the 1970s and continue to be produced, despite enjoying a heyday during the 1980s. The most notable brand is the Casio Databank series, though watches made by Timex were also popular.
It was created by Wilhelm Schickard. -
Calculator
This article is about the electronic device. For mechanical precursors to the modern calculator, see Mechanical calculator. For other uses, see Calculator.
It was crested by a Japanese company called Busicom. -
Solar Calculator
Are hand-held electronic calculators powered by solar cells mounted on the device. They were introduced at the end of the 1970s.
It was created by Anonimous. -
Abacus
Also called a counting frame, is a calculating tool that was in use in Europe, China and Russia, centuries before the adoption of the written Hindu–Arabic numeral system and is still used by merchants, traders and clerks in some parts of Eastern Europe, Russia, China and Africa. Today, abaci are often constructed as a bamboo frame with beads sliding on wires, but originally they were beans or stones moved in grooves in sand or on tablets of wood, stone, or metal.
It was created by the Chineses.
