History of computers timeline
1440
1694
300 bc
1642
1621
1822
leibniz`s universal calculator
oughtred`s slide rule
Abacus
Printing press
Pascal pascaline
difference engine
Abacus
The abacus is one of the first instruments used for calculations. It uses beads sliding along a series of metal or wooden wires or rods atached to a frame to represent unitS, TENS, HOUNDREDS, THOUSANDS, TENS OF THOUSANDS, HOUNDRED OF THOUSANDS...
This is how it works
Printing press
A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium, thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in which the cloth, paper, or other medium was brushed or rubbed repeatedly to achieve the transfer of ink and accelerated the process
Oughtred’s slide rule
William Oughtred made the first slide rule by inscribing logarithms on wood or ivory. Before the invention of the pocket or handheld calculator, the slide rule was a popular tool for calculations. The use of slide rules continued until about 1974, after which electronic calculators became more popular.
Pascal Pascaline
The Pascaline is a direct adding machine (it has no crank), so the value of a number is added to the accumulator as it is being dialed in. By moving a display bar, the operator can see either the number stored in the calculator or the complement of its value. Subtractions are performed like additions using some properties of 9's complement arithmetic.
Leibniz's universal calculator
The stepped reckoner or Leibniz calculator was a mechanical calculator invented by the German mathematician Gottfried Wilhelm Leibniz around 1672 and completed in 1694.[1] The name comes from the translation of the German term for its operating mechanism, Staffelwalze, meaning "stepped drum". It was the first calculator that could perform all four basic
difference engine
difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. It was designed in the 1820s, and was first created by Charles Babbage. The name difference engine is derived from the method of divided differences,