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 36 inch 77 inch 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 fluid 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 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 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 115 - It follows from an examination made in this way that -nnftuny of a milligram of calcium chloride can be detected easily and with absolute certainty. Only the calcium compounds, volatilized in the flame, show this reaction, and the more volatile they are the more distinct it is. Chloride of calcium, iodide of calcium, and bromide of calcium are best in this respect. Sulphate of calcium gives a spectrum only after it has become basic but then very brilliantly and long continued. In the same way the...
Page 41 - 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 equals their radiation. Hence the radiation impinging...
Page 43 - ... and each particle of each substance radiating into the inclosure, from the sides of which it is reflected many times backwards and forwards before it is finally absorbed, — this being the case, will the law of equal and independent radiation, and those of reflection and refraction so fit with one another, that every particle of the walls of the inclosure shall absorb precisely as much heat as it radiates? It will be endeavoured to show that these laws are so adapted to each other.
Page 117 - ... and still more the geologist with a series of highly simple tests for determining many substances occurring in nature even in 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...
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 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 122 - By an application of this method to geological inquiries concerning the distribution and arrangements already mentioned, we are led to the unexpected conclusion, that not only potassium and sodium, but also lithium and strontium, must be added to the list of bodies occurring only indeed in small quantities, but most widely spread throughout the matter composing the solid body of our planet.