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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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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.

Cap. 2. 30 Electric orientations ; and Magnetic Science while the electric force merely tends to heap them together in shapeless clusters. These facts appeared to Gilbert to indicate that electric phenomena are due to something of a material nature, which under the influence amber of friction is liberated from the glass or which under ordinary circumstances it is imprisoned. In support of this view he adduced evidence from other quarters. Being a physician, he was well acquainted with the doctrine in human body humours or kinds of and melancholy, which, as they predominated, were supposed to determine the temper of mind; and when he observed that electrifiable bodies were almost all hard and transparent, and therefore (according to the that the moisture contains various phlegm, blood, choler, ideas of that time) formed by the consolidation of watery liquids, he concluded that the common menstruum of these liquids must be a particular kind of humour, to the possession of which the electrical properties of bodies were to be referred.

That the eclipses of the first Roemer* (b. 1644, by 1710) Jupiter were apparently affected by an unknown cause the time of the occurrence of the phenomenon disturbing was retarded when the earth and Jupiter, in the course of their satellites of ; happened to be most remote from each other, and accelerated in the contrary case. Eoemer explained this orbital motions, by supposing that requires light a finite time for its pro- pagation from the satellite to the earth and by observations of eclipses, he calculated the interval required for its passage from ; the sun to the earth (the light-equation, as 11 minutes, f it is called) to be Shortly after Roemer's discovery, the wave-theory of light was greatly improved and extended by Christiaan Huygens (b.

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A History of the Theories of Aether and Electricity -From The Age of Descart by Edmund T Whittaker

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