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slide rule Figure 8: Analog addition of two numbers, A and B, using slide rules.
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Figure 8: Analog addition of two numbers, A and B, using slide rules.
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Key People

William Oughtred, watercolour by George Perfect Harding after an engraving by Wenceslaus Hollar, 1644; in the National Portrait Gallery, London.
William Oughtred
English mathematician
Edmund Gunter
English mathematician