A treatise on solar action, explaining the causes of light, heat, motion and electricity

George Nall, 1865 - 43 pàgines

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Pàgina 25 - ... exposed to the full power of solar heat, is but little disturbed. If, however, we reflect the sun's rays from a metal surface, an exactly contrary result takes place : the uncovered parts are the first to melt, and the blackened card stands high above the surrounding portion.
Pàgina 27 - The air on high mountains may be intensely cold, while a burning sun is overhead ; the solar rays which, striking on the human skin, are almost intolerable, are incompetent to heat the air sensibly, and we have only to withdraw into perfect shade to feel the chill of the atmosphere. I never, on any occasion...
Pàgina 12 - The dynamical theory, or, as it is sometimes called, the mechanical theory of heat, discards the idea of materiality as applied to heat. The supporters of this theory do not believe heat to be matter, but an accident or condition of matter ; namely, a motion of its ultimate particles.
Pàgina 38 - The very quality of the solar rays — their incomparable penetrative power — enables us to infer that the temperature of their origin must be enormous ; but in the fall of asteroids we find the means of producing such a temperature. It may be contended that this showering down of matter must be accompanied by the growth of the sun in size ; it is so ; but the quantity necessary to produce the observed calorific emission, even if accumulated for 4,000 years, would defeat the scrutiny of our best...
Pàgina 33 - ... in short, a series of them may be traced from mere films of vapour to dense matter, and all having a fixity of position which show they belong to no system.

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