The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff, and Kirchhoff and BunsenAmerican Book Company, 1901 - 131 pages |
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Common terms and phrases
05 inch thick absorbed alum axis BALFOUR STEWART black body black heat blackened paper calcium caloric carbonate chloride cone cooling crown glass 05 description of heat diaphragm diathermancy diathermanous direction discrete fluids equal equilibrium of heat flame focal bodies galvanometer gave glass 05 inch group of experiments heat falling heat radiated high temperature hydrochloric acid intensity interior Kirchhoff lamp lampblack lampblack heat less lithium Memoirs metals mica milligram observation particles pass pencil of rays perpendicular phenomena piece of rock PIERRE PRÉVOST pile placed plane of polarization plate of crown plate of glass plate of rock polished plates portion potassium Professor Forbes quantity of heat radiant heat radiation from rock reaction reflection of cold rock salt rock salt 18 roughened salt 18 inch screen selenite small angle CAD sodium source of heat spectra spectrum strontium substance suppose thermometer thickest piece thin plate tion unequal exchanges vis viva wave length
Popular passages
Page 40 - Considering, therefore, the heat of any temperature to consist of heterogeneous rays, we may state the law thus: The absorption of a plate equals its radiation, and that for every description of heat.
Page 23 - ... only 15 per cent. The second group of experiments was designed to compare together the quantities of heat radiated at the same temperature from polished plates of the same substance, but of different thicknesses. The result of this group was, that while the difference between the radiating power of thick and thin glass is so small as not to be capable of being directly observed, there is a perceptible difference between the radiation from thick and thin mica, and a still more marked difference...
Page 40 - We conclude, therefore, that every body which sifts heat in its passage through its substance is more opaque with regard to heat radiated by a thin slice of its own substance, than it is with regard to ordinary heat.
Page 48 - That the flow of heat from the interior upon the surface of a substance of indefinite thickness, is proportional caeteris paribus to its index of refraction, and that for every description of heat.
Page 68 - ... we may imagine that part of the heat from the interior particles is allowed to pass, thereby swelling up the total radiation to that which it is by DULONG and PETIT'S law.
Page 117 - ... the smallest particle, such, for example, as the minerals so similar to one another, consisting of double silicates, containing lime, with a certainty which is scarcely attainable with an abundant supply of material by means of an extended and protracted analysis. Some examples will illustrate this best. 1. A drop of sea-water evaporated on a platinum wire showed a strong sodium reaction, and after volatilizing the chloride of sodium a weak calcium reaction which, by moistening the wire with...
Page 34 - The common opinion that rock salt is equally diathermanous for all descriptions of heat is therefore untenable. The fourth group of experiments shows that heat from thick plates of glass, mica, or rock salt is more easily transmitted by screens of the same nature as the heated plate than heat from thin plates of these materials. It was shown that all these experiments may be explained by PreVost's theory of exchanges, somewhat extended. This extension consists of the following laws: — 1. Each particle...
Page 104 - F with a reflecting angle of 60° and rilled with carbon disulphide. The prism rests on a brass plate which can be rotated on a vertical axis. This axis carries on its lower end the mirror G and above it the arm H which serves as the handle to rotate the prism and the mirror. A small telescope is adjusted before the mirror which gives an image of a horizontal scale placed at a short distance. By rotating the prism we can cause to pass before the vertical thread of the telescope C the entire spectrum...