Physical Review, Band 24American Physical Society, 1907 In Feb. 1903, the separate publication of the Bulletin of the American Physical Society was discontinued and Its Proceedings published in the Physical review. |
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Seite 419 - ... drop, when it instantly becomes dark again. The reason for this behavior is not quite as apparent as in the case of the needles. In fact I am not quite sure that I understand it at all. Quartz behaves in the same way. A drop of clear fused quartz, heated in the blast, emits little or no light, but if it contains spots made up of an emulsion of quartz and air, these spots emit strongly. In other words an opacity resulting from a pulverization of the transparent medium seems to be accompanied with...
Seite 289 - ... present paper will be used in the subsequent calculations, which will be found to be in slight disagreement with the writer's previous results. As a whole, it will be shown how easy it is to obtain estimated values which ultimately can have but little meaning other than a guide in experimental work. THE EFFECTIVE TEMPERATURE OF THE SUN. It has been shown by Poynting2 that, when a surface is a complete radiator and absorber, its temperature can be determined at once by the fourth power law, if...
Seite 290 - It is much better described as 'a full absorber' or 'a full radiator,'" ie, a complete radiator, as distinguished from a partial radiator or so-called "non-black body." In justice to Kirchhoff who was the first to give a clear discussion of this subject, it should be called the Kirchhoff radiator.
Seite 498 - Abstract of a paper presented at the New York meeting of the Physical Society, October 12.
Seite 508 - Duddell singing arc; abstract of a paper presented at the Washington meeting of the Physical Society, April 26-27, 19°9.
Seite 293 - ... not coincident with the eclipse curve, unless the emissivity is of the order 0.3 a. Hence the writer's1 previous surmise that at the beginning of totality radiation should still be appreciable is substantiated, although the observations made by Langley seemed to contradict it. Very's observations2 show that during totality of the eclipse of January 17, 1889, the radiation from the umbra of the eclipsed moon was about i per cent of the heat which was to be 1 Phys. Rev., 23, p. 247, 1906. 'Very:...
Seite 360 - SUMMARY. The results of the above investigation upon resorufin, as a typical fluorescent substance, taken in connection with the work of B. Walter and with the experiments described in Chapter I, seem to establish the truth of the following statements : 1. Fluorescent solutions are optically perfect substances,/, e., they obey Lambert's law. 2. Beer's law, ie, that increase of concentration is equivalent to increase in thickness, is true for dilute but not for concentrated solutions. 3. A change...
Seite 295 - ... specular") reflection. On the other hand, energy reflected from a rough surface suffers "diffuse" reflection. The rough surface is equivalent to numerous small, plane, reflecting surfaces, the planes of which lie in all directions. In "diffuse reflection" for each infinitesimal surface, the ordinary laws of reflection are obeyed in full, unless the linear dimensions of the reflecting surface or of the rugosities or inequalities on it are small compared with the wave-length. However, the unpolished...
Seite 291 - Poynting (loc. cil.) computes the upper limit of temperature of the surface exposed to a zenith sun to be abs. But this upper limit to the temperature of the hottest part of an airless planet is never attained because the moon turns the same face to the earth instead of to the sun. He shows that, if N is the normal stream of radiation from a unit of surface of the moon immediately under the sun, the normal stream from the equivalent flat disk is Nd=$N. " The effective temperature of the flat disk...
Seite 237 - ... is an empirical law based primarily on the observation that a uniformly bright sphere, when viewed at a distance appears as a uniformly bright disk. It would seem to...