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Calculating clock
Willhelm Schickard invented the "Calculating Clock", the first mechanical calculator. -
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Calculators
The first calculator was invented in 1623 but it is not known on which day it was made. -
Pascal's Calculator
The mechanical calculator was invented by the famous Blaise Pascal. It will perform all four arithmetic operations without relying on human intelligence. It could add and subtract two numbers directly and multiply and divide by repetition. -
Stepped Reckoner
Gottfried Leibniz developed the Stepped Reckoner using stepped gear wheels. It performed the 4 functions, but didn't work very well. -
Difference Engine
Per Georg Scheutz built several difference engines from 1855 onwards, one of which was sold to the British government in 1859. -
Pin-wheel calculator
Frank Baldwin invents the pin-wheel calculator in the US. -
Comptometer
Dorr E. Felt invents the Comptometer, the first key-driven calculating machine. In 1886 he joined with Robert Tarrant to form the Felt & Tarrant Manufacturing Company which went on to make thousands of Comptometers. -
Dalton Adding Machine
The push-button calculator was develpoed by James L. Dalton in the United States. It was called the Dalton adding machine after James Dalton. -
Model K
The "Model K" (for "kitchen table"), which calculated using binary addition, was invented.It was a relay-based calculator that George Stibitz made. -
Complex Number Calculator
The complex Number calculator was invented by George Stibitz -
Curta Calculator
The Curta calculator was developed in 1948 and, although costly, became popular for its portability. This purely mechanical hand-held device could do addition, subtraction, multiplication and division
