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The logarithm of a number is the exponent to which another fixed value, the base, must be raised to produce that number. Were invented by John Napier
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Blaise Pascal invented his numerical wheel calculator called the Pascaline to help his father a French tax collector count taxes.
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A difference engine is an automatic mechanical calculator designed to tabulate polynomial functions. Charles Babbage proposed it's used.
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The Turing machine was invented in 1936 by Alan Turing. The Turing machine is not intended as practical computing technology, but rather as a hypothetical device representing a computing machine.
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The Harvard Mark 1 computer, designed by Howard Aiken,was a general purpose electro-mechanical computer that was used in the war effort during the last part of World War II.
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Is a set of electronic circuits on one small plate. Designed by Jack Kilby.
