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Clive Greated

(b Freshwater, Isle of Wight, July 18, 1635; d London, March 3, 1702). English physicist. He was educated at Westminster School and at Christ Church, Oxford, where he encountered leading natural philosophers associated with empirical learning, including Robert Boyle, whose assistant he became. In 1662 he became curator of experiments to the Royal Society, holding the post for 15 years. He was one of the six commissioners who supervised the rebuilding of London after the 1666 fire.

In his own day Hooke was most noted for his Micrographia (1665), concerned with his observations with the microscope; now he is most famous for having proclaimed a general law of elasticity. He is known in acoustics for having (unjustly) claimed to have proved that the vibrations of a simple spring are isochronous; for having shown the Royal Society in 1681 ‘a way of making Musical and Other Sounds...


C. Truesdell

revised by Murray Campbell

(b La Flèche, March 24, 1653; d Paris, July 9, 1716). French acoustician. In 1670 he went to Paris, where he attended the lectures of the Cartesian physicist Rohault; his works do not display the knowledge of advanced mathematics that characterizes the scientific progress of the age of Newton, although he held a chair of mathematics for a decade. He was elected to membership of the Académie des Sciences (1696), which left him free to develop his interest in acoustics. He thoroughly mastered the idea of frequency and was the first to interpret beats correctly. He also introduced the terms ‘acoustique’ (acoustics), ‘son harmonique’ (harmonic sound) and ‘noeud’ (node). His papers, though not so original as he may have thought them, were fairly clear and descriptive; they were very widely read, and certainly they had great effect upon the centrally important work of Daniel Bernoulli a quarter of a century later. He suffered from a speech defect and is said to have had no ear for music. His works include ...