The Laws of Radiation and Absorption: Memoirs by Prévost, Stewart, Kirchhoff, and Kirchhoff and BunsenAmerican Book Company, 1901 - 131 pages |
Other editions - View all
Common terms and phrases
05 inch thick 36 inch 77 inch absorbed absorption alum BALFOUR STEWART black body black heat blackened paper calcium caloric carbonate cent cone cooling crown glass 05 description of heat diaphragm diathermancy diathermanous direction discrete fluids equal equilibrium of heat flame galvanometer gave glass 05 inch group of experiments heat falling heat of high heat radiated high temperature hydrochloric acid intensity interior Kirchhoff lamp lampblack heat less lithium Memoirs metals mica milligram observed particles passed pencil of rays perpendicular piece of rock PIERRE PRÉVOST pile placed plate of crown plate of glass plate of rock polished polished plates portion potassium Professor Forbes proportion of heat proportional radiation quantity of heat radiant heat reaction reflection of cold result rock salt heat selenite sets of experiments small angle CAD sodium source of heat spectra spectrum strontium substance suppose table salt thermometer thin plate tion unequal exchanges vis viva wave length
Popular passages
Page 41 - ... proportion would be absorbed in its passage from B to C, than was absorbed of the equally intense ray at A, in its passage between A and B. The amount of heat absorbed by the particles between B and C would therefore be different from that absorbed by the particles between A and B. But this cannot be ; for, on the hypothesis of an equal and independent radiation of each particle, the radiation of the particles between B and C is equal to that of the particles between A and B, and their absorption...
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 114 - ... immersion. Fusion can be effected in this spiral much quicker than in the platinum crucible, since the mass of the platinum heated is small and the salt to be fused comes into immediate contact with the flame. If we transform the fine pulverized substance to be tested into the glowing fluid soda by means of a small platinum spatula, and maintain it in a glowing state for a few minutes, we need only to knock the spiral, inverted with its vertex upward, on the edge of the lamp stand in order to...
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 41 - B with the same intensity as it had at A. But the quality of the ray at B will also be the same as its quality at A. For, if it were different, then either a greater or less proportion would be absorbed in its passage from B to C, than was absorbed of the equally intense ray at A, in its passage between A and B. The amount of heat absorbed by the particles between B and C would therefore be different from that absorbed by the particles between A and B. But this cannot be ; for, on the hypothesis...
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 40 - ... direction DA. This ray, in passing from A to B will have been partly absorbed by the substance between A and B; but the radiation of the upper plate being equal to its absorption (since its temperature remains the same), the ray will have been just as much recruited by the united radiation of the particles between A and B, as it was diminished in intensity by their absorption. It will therefore reach B with the same intensity as it had at A. But the quality of the ray at B will also be the same...