Computer science development of sophisticated computing equipment. Wilhelm Schickard designed and constructed the first working mechanical calculator in 1623. In 1673, Gottfried Leibniz demonstrated a digital mechanical calculator, called the Stepped Reckoner. He may be considered the first computer scientist and information theorist, for, among other reasons, documenting the binary number system. In 1820, Thomas de Colmar launched the mechanical calculator industry when he released his simplified arithmometer, which was the first calculating machine strong enough and reliable enough to be used daily in an office environment. Charles Babbage started the design of the first "automatic mechanical calculator", his Difference Engine, in
David Hartley (computer scientist) of the Computer Conservation Society from 2007 to 2011. Dr. Hartley became an undergraduate at Clare College, University of Cambridge in 1956. He read Mathematics for the first two years and studied Numerical Analysis and Automatic Computing in his third year, graduating BA in 1959. He then became a research student of Computer science developing the first programming language "Autocode", and its compiler for the EDSAC 2 computer, for which he was awarded a PhD in 1963. His thesis was entitled "Automatic Programming for Digital Computers". As a member of the staff of the university's Mathematical Laboratory he was joint