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By Edmund T Whittaker

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Extra info for A History of the Theories of Aether and Electricity -From The Age of Descart

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T Nov. , Lib. , Aphor. xx. Micrographia, p. 37. J Mechanical Production of Heat and Cold. || D Opticks. 34 Electric and Magnetic Science when heated beyond a certain Degree, emit Emission this not performed by the light " Parts ? their of Motion and, moreover, suggested the vibrating converse of this, namely, that when light is absorbed by a fixed Bodies, all and shine ; and is material body, vibrations are set senses as heat. The doctrine that heat is up which are perceived by the a material substance was main- tained in Newton's lifetime by a certain school of chemists.

P. 17. that Huygens' maybe remarked " following Hooke, call pulses "; having the property of periodicity. * Huygens to t is The introduction of this principle enabled Hooke and other contemporary succeed where wave-theoristsf had failed, in achieving refraction and reflexion. the explanation of His method was to combine his own principle with Hooke's device of following separately the fortunes of the right-hand and left-hand sides of a wave-front when it The actual explana- reaches the interface between two media.

Hooke's next effort was to produce a mechanical theory of " Because," he by Descartes. mediums are not Homogeneous to one says, "all transparent how this pulse or motion another, therefore we will next examine refraction, to replace that given mediums. will be propagated through differingly transparent excellent and acute most the Philosopher And here, according to of inclination in the suppose the sine of the angle medium to be to the sine of refraction in the second, as the Cartes, I Des first to the density of the second.

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