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Earth (1)
Physics (1)
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On a Determination of the Mean Density of the Earth and the Gravitation Constant by means of the Common Balance. Received May 13, - Read June 4, 1891.
(London, Harrison and Sons, 1892). 4to. No wrappers as extracted from ""Philosophical Transactions"", 1891, Vol. 182 - Series A. Pp. 565-656 a. 7 lithographed plates.
First appearance of this importent paper for which Poynting was awarded the Adams Prize of Cambridge.""These days John Henry Poynting is best known for his association with the Poynting vector, which describes the flow of energy in an electromagnetic field, and little is known of his life or work. Yet in the 1890s he caught the popular imagination as the man who weighed the Earth'. His experiment, using a novel method with a common balance, was part of a heroic tradition, gained him Cambridge University's Adams Prize, and set new standards of precision. Yet in performing this experiment, Poynting seemed to step outside the traditions of late nineteenth century Cambridge University where he was educated, and it is probably significant that he was a Unitarian throughout his life.""(Isobel Falconer)..
An Experiment in Search of a Directive Action of one Quartz Crystal on another. Received September 27, - Read November 17, 1898.
(London, Harrison and Sons, 1892). 4to. No wrappers as extracted from ""Philosophical Transactions"", 1891, Vol. 192 - Series A. Pp. 245-256, textillustr.
First printing of these experiments in oder to measutre the gravitational constant.""Closely related to his investigations on the constant of gravitation is the experiments in search of a directive action of one quartz crystal on another, which, though leading to a negative result is a model of the application of refined methods to physical researc of great delicacy.""(From the motivation for receivind the Royal Medal).
