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| | The Modern History of Computing |
 | | These human computers did the sorts of calculation nowadays carried out by electronic computers, and many thousands of them were employed in commerce, government, and research establishments. |
 | | In analog computers, numerical quantities are represented by, for example, the angle of rotation of a shaft or a difference in electrical potential. |
 | | In 1949, the Manchester computer was successfully equipped with a drum memory; this was constructed by the Manchester engineers on the model of a drum developed by Andrew Booth at Birkbeck College, London. |
| plato.stanford.edu /entries/computing-history (6645 words) |
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