Contributions to Molecular Physics in the Domain of Radiant Heat: A Series of Memoirs Published in the 'Philosophical Transactions' and 'Philosophical Magazine,' with Additions

Longmans, Green, and Company, 1872 - 446 pÓgines
First edition of an important collection of memoirs, from Febr. 1861 on, in the field of Tyndall's major work, the effects of solar and heat radiation on atmospheric gases (1860-1870). He then considered the scattering of light particles in the atmosphere (the Tyndall effect) and explained the blue color of the sky (Rayleigh scattering). The scattering of sunlight by dust particles led him to consider means of destroying airborne organic matter by heat . Tyndall is remembered chiefly for his efforts to verify the high absorptive and radiative power of aqueous vapor; to measure the absorption and transmission of heat by many different gasses and liquids . Practical applications of his work in meteorology, fog signaling, and bacteriology were seen within his lifetime. . (DSB).

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PÓgina 57 - The external circuit being interrupted, and the source of heat being sufficiently distant from the pile to give a deflection not exceeding 5 degrees of the galvanometer, let the wire be placed from v to v; the needle falls to 1░'5. The connection between the two vessels being again interrupted, let the source be brought near enough to obtain successively the deflections : — 5░, 10░, 15░, 20░, 25░, 30░, 35░, 40░, 45░.
PÓgina 56 - The vessels and wires thus disposed make no change in the action of the instrument; the thermo-electric current being freely transmitted, as before, from the pile to the galvanometer. But if, by means of a wire F, a communication be established between the two vessels, part of the current will pass through this wire and return to the pile. The quantity of electricity circulating in the galvanometer will be thus diminished, and with it the deflection of the needle. Suppose, then, that by this artifice...
PÓgina 443 - ... without refilling the experimental tube, fifteen or twenty clouds in succession. The clouds thus precipitated differed from each other in luminous energy, some shedding forth a mild white light, others flashing out with sudden and surprising brilliancy. This difference of action is, of course, to be referred to the different reflective energies of the particles of the clouds, which were produced by substances of very different refractive indices. Different clouds, moreover, possess very different...
PÓgina 419 - A medium also embraces our atoms ; within our atmosphere exists a second and a finer atmosphere, in which the atoms of oxygen and nitrogen hang like suspended grains. This finer atmosphere unites not only atom with atom, but star with star ; and the light of all suns and of all stars is, in reality, a kind of music propagated through this interstellar air.
PÓgina 440 - Nothing could more perfectly illustrate that ' spiritual texture ' which Sir John Herschel ascribes to a comet than these actinic clouds. Indeed the experiments prove that matter of almost infinite tenuity is competent to shed forth light far more intense than that of the tails of comets.
PÓgina 422 - ... the chill at night is painful to bear. In Australia, also, the thermometric range is enormous, on account of the absence of this qualifying agent. A clear day, and a dry day, moreover, are very different things. The atmosphere may possess great visual clearness, while it is charged with aqueous vapour, and on such occasions great chilling cannot occur by terrestrial radiation.
PÓgina 422 - The aqueous vapour constitutes a local dam, by which the temperature at the earth's surface is deepened : the dam, however, finally overflows, and we give to space all that we receive from the sun. The sun raises the vapours of the equatorial ocean ; they rise, but for a time a vapour screen spreads above and around them.
PÓgina 266 - Nothing, I think, could more forcibly illustrate the special relationship which subsists between the optic nerve and the oscillating periods of luminous bodies. The nerve, like a musical string, responds to the periods with which it is in accordance, while it refuses to be excited by others of vastly greater energy which are not in unison with its own.
PÓgina 279 - When the ends of the perpendiculars are united, the curve beyond the red, representing the obscure radiation, rises in a steep and massive peak, which quite dwarfs by its magnitude the radiation of the luminous portion of the spectrum.
PÓgina 419 - ... the term atmosphere and the term radiation. It is well known that our atmosphere is mainly composed of the two elements, oxygen and nitrogen. These elementary atoms may be figured as small spheres scattered thickly in the space which immediately surrounds the earth. They constitute about 99J per cent, of the atmosphere.

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