Monthly Notices of the Royal Astronomical Society, Volumes 27-28

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Priestley and Weale, 1867
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Page 168 - Prof. Stokes mentioned to me at Cambridge some time ago, probably about ten years, that Prof. Miller had made an experiment testing to a very high degree of accuracy the agreement of the double dark line D of the solar spectrum with the double bright line constituting the spectrum of the spirit-lamp burning with salt.
Page 170 - All these facts are comprehended in the statement that in a constant temperature the absorption of a particle is equal to its radiation, and that for every description of light. It was also noticed that all coloured glasses ultimately lose their colour in the fire as they approach in temperature the coals around them, the explanation being, that while red glass, for instance, gives out a greenish light, it passes red light from the coals behind it, while it absorbs the green...
Page 262 - Clusters (Cl.) are members of the Via Lactea, and are nearer to us than the average of its faint stars. 2. The Nebulae resolved and unresolved lie in general without the Via Lactea, which is therefore essentially stellar. 3. The visible universe is composed of systems, of which the Via Lactea, the two Nubecula, and the Nebulae, are the individuals, and which are themselves composed of stars (either simple, multiple, or in clusters) and of gaseous bodies of both regular and irregular outlines.
Page 161 - The light of the star is compound, and has emanated from two different sources. Each light forms its own spectrum. In the instrument these spectra appear superposed. The principal spectrum is analogous to that of the sun, and is evidently formed by the light of an incandescent solid or liquid photosphere, which has suffered absorption by the vapours of an envelope cooler than itself. The second spectrum consists of a few bright lines, which indicate that the light by which it is formed was emitted...
Page 180 - The spectrum of the dark zone beneath the Southern Polar spot appeared as a dusky band when compared with the spectra of the adjoining brighter parts of the planet. This fainter spectrum appeared to possess a uniform depth of shade throughout its length. This observation would indicate that the material which forms the darker parts of the planet's surface, absorbs all the rays of the spectrum equally. These portions should be therefore neutral, or nearly so, in colour. I do not now regard the ruddy...
Page 271 - THEORETICAL ASTRONOMY, relating to the motions of the heavenly bodies revolving around the sun in accordance with the law of universal gravitation, embracing a systematic derivation of the...
Page 262 - Green and me ; but the time it happened was not noted by either of us : it appeared to be very difficult to judge precisely of the times that the internal contacts of the body of Venus happened, by reason of the darkness of the penumbra at the Sun's limb, it being there nearly, if not quite, as dark as the planet.
Page 180 - ... with particular portions of the planetary surface. The evidence we possess at present appears to support the opinion that the planet's distinctive colour has its origin in the material of which some parts of its surface are composed. Mr. Lockyer's observation that the colour is most intense when the planet's atmosphere is free from clouds obviously admits of an interpretation in accordance with this view.
Page 262 - Fig. 5 (not given) is a representation of the appearance of Venus at the middle of the egress and ingress, for the very same phenomenon was observed at both : at the total ingress, the thread of light made its appearance with an uncertainty of several seconds ; I judged that the penumbra was in contact with the Sun's limb 10...
Page 88 - With a powerful spectroscope the light reflected from our atmosphere near the sun's limb edge would be greatly reduced in intensity by the dispersion of the prisms, while the bright lines of the prominences, if such be present, would remain but little diminished in brilliancy. This principle has been carried out by various forms of prismatic apparatus, and also by other contrivances, but hitherto without success.

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