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
Glasenapp, in an inaugural dissertation published in 1875, discussed the eclipses of the first satellite between 1848 and s s the 1870, and derived, by different assumptions, values between 496 and 501 S most probable value being 500-8 8 Sampson, in 1909, derived 498'64 from his own readings of the Harvard Observations, and 498'79 S from the Harvard readings, with probable errors of about + 0'02". The inequalities of Jupiter's surface give , . rise to % some difficulty in exact determinations. this time returned to Holland.
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. The most conspicuous member of the school was Wilhelm Homberg 1715) of Paris, who* identified heat and light with the sulphureous principle, which he supposed to be one of the primary (b. 1652, d. ingredients of all bodies, and to be present even in the interplanetary spaces. Between this view and that of Newton it seem as if nothing but sharp opposition was to be a few years later the professed exponents of the But expected, jPrincipia and the Opticks began to develop their system under might at first the evident influence of Homberg's writings.
Conceptions which have been entertained fall heat into one or other of two classes, according as concerning heat is represented as a mere condition producible in bodies, or various The former view, which is that universally held at the present day, was advocated by the great philosophers of the seventeenth century. Bacon maintained it in as a distinct species of matter. " And Newton|| asked " Do not declared that is : * Newton himself (Oplicks, p. 349) suspected that light-corpuscles and ponderable matter might be transmuted into each other much later, Boscovich (Theoria, pp.