Contributions to Molecular Physics in the Domain of Radiant Heat: A Series of Memoirs Published in the 'Philosophical Transactions' and 'Philosophical Magazine,' with AdditionsLongmans, Green, and Company, 1872 - 446 Seiten 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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Andere Ausgaben - Alle anzeigen
Häufige Begriffe und Wortgruppen
absorbed Absorption per 100 Acetic ether action æther alcohol Amylene apparatus aqueous vapour atoms augmented beam Benzol bisulphide of carbon blue calorescence calorific rays carbonic acid cell cent chamber chemical chilling chloride Chloroform cloud colour column cube cubic inch Deflection Absorption degrees density diathermancy dry air dynamic radiation effect electric-light employed experimental tube experiments Formic ether galvanometer gases glass hydrochloric acid hydrogen flame intercepted invisible rays Iodide of methyl iodine lampblack light liquid luminous Measures Observed Calculated Melloni memoir mercury minutes moist air molecules needle nitric acid nitrite of amyl Nitrous oxide obtained olefiant gas opaque oxide oxygen particles passed perfectly placed plates of rock-salt plates of salt platinum spiral polarization precipitated Professor Magnus quantity radiant heat radiation radiation and absorption solution source of heat spectrum substance Sulphuric ether surface TABLE temperature thermo-electric pile thickness tion transmission transparent Unit-measure vibrating visible wire
Beliebte Passagen
Seite 55 - 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°.
Seite 54 - 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...
Seite 415 - 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.
Seite 418 - ... 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.
Seite 418 - 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.
Seite 264 - 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.
Seite 277 - 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.
Seite 415 - ... 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.