PETTY, William. The Discourse made before the Royal Society the 26 of November 1674 concerning the use of duplicate proportion ... together with a new hypothesis of springing or elastique motions, London: for John Martyn, 1674, 12°, with A1 authorisation leaf and a4 errata, late 19th-century calf with Houghton crest (some rubbing), ex libris of Robert, Marquis of Crewe. [Keynes William Petty 16; Wing 1919]

Details

PETTY, William. The Discourse made before the Royal Society the 26 of November 1674 concerning the use of duplicate proportion ... together with a new hypothesis of springing or elastique motions, London: for John Martyn, 1674, 12°, with A1 authorisation leaf and a4 errata, late 19th-century calf with Houghton crest (some rubbing), ex libris of Robert, Marquis of Crewe. [Keynes William Petty 16; Wing 1919]

Lot Essay

Petty was one of the original Fellows of the Royal Society. The subject of his paper is made clearer in the Dedication to the Duke of Newcastle where he calls it an attempt "to excite the World to the study of a little Mathematics, by shewing the use of 'Duplicate Proportion' in some of the most weighty of Humane affairs, which notion a Child of 12 years may have in an hour."

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