Abacus 4th Century B. C


Charles Babbage 1822 Babbage's Difference Engine Analytical Engine



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computer-history-powerpoint revised 1-20-13

Charles Babbage


1822 Babbage's Difference Engine

Analytical Engine

  • 1833
  • Used to perform a variety of calculations by following a set of instructions or programs stored on punch cards
  • Machine only designed but never built

Joseph Jacquard

Charles Babbage


Considered the “Father of Computers”

First Computer Programmer


Ada Byron, Countess of Lovelace

Matiste 2015


U.S. Census


Matiste 2015

Herman Hollerith

Hollerith’s Punch Card

Tabulating Machine

Tabulating Machine

  • Used electricity rather than mechanical gears
  • Holes representing information to be tabulated were punched in cards
  • The location of each hole represented a specific piece of information (male vs. female)
  • Cards inserted into the machine and metal pins used to open and close electrical circuts
  • If the circuit was closed, a computation was increased by one

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