Spectrum analysis in its application to terrestrial substances, and the physical constitution of the heavenly bodiesLongmans, Green, 1872 - 626 páginas |
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Términos y frases comunes
absorption Ångström appear atmosphere Aurora Aurora Borealis blue body bright bands bright lines brilliant Bunsen calcium carbon chromosphere cloud coincident colored rays comet continuous spectrum corona dark lines direct-vision direction displacement earth earth's atmosphere Eclipse of August edge emitted F-line faint flame Fraunhofer lines gases glass glowing green heat Huggins hydrogen gas hydrogen lines incandescent inches instrument intense investigations iron Kirchhoff Kirchhoff's lens Lockyer luminous magnesium metal meteoric stones millimetre moon motion nebula nitrogen nucleus observed orbit oxygen particles pass penumbra phenomena photographic photosphere planets plate portion position prism Prof prominences refraction refrangibility round the sun Secchi seen slit sodium sodium line Solar Eclipse solar spectrum solar spot spec spectra spectroscope spectrum analysis stars stratum substance sun's disk sun's limb surface telescope temperature terrestrial tion Total Solar Eclipse trum tube umbra velocity vibrations violet visible wave-length white light yellow Zöllner
Pasajes populares
Página 163 - a flame in which salt was burning, dark lines appeared in the spectrum in the position of the sodium lines. The same thing occurred when, instead of a cylinder of incandescent lime, a platinum wire was used, which, after being made to glow in a flame, was brought nearly to its
Página 127 - of sodium, which, according to mechanical explanation thus suggested, being particularly opaque for light of that quality, prevents such of it as is emitted from the sun from penetrating to any considerable distance through the surrounding atmosphere. The test of this theory must be had in ascertaining whether or not
Página 217 - near the sun's 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."] In.
Página 127 - of sodium must possess, by its molecular structure, a tendency to vibrate in the periods corresponding to the degrees of refrangibility of the double line D. Hence the presence of sodium in a source of light must tend to originate light of that quality. On the other hand,
Página 127 - of sodium in an atmosphere round a source must have a great tendency to retain on itself, ie, to absorb and to have its temperature raised by light from the source of the precise quality in question. In the atmosphere around the sun, therefore, there must be present
Página 55 - of an inch. The velocity of light being taken at 192,000 miles in a second, if we multiply this number by 39,000 we obtain the number of waves of red light in 192,000 miles; the product is 474,439,600,000,000. All these waves enter the eye in a second. In the same interval 699,000,000,000,000 waves of violet light enter the eye.
Página 217 - gaseous, their spectra would consist of bright lines. With a powerful spectroscope the light scattered by our atmosphère near the sun's 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.
Página 234 - Here one is reminded, by the fleecy, infinitely delicate cloud-films, of an English hedgerow with luxuriant elms ; here of a densely intertwined tropical forest, the intimately interwoven • branches threading in all directions, the prominences generally expanding
Página 97 - true spectrum of the metal is obtained. In none of the spectra of the more reducible alkaline metals (potassium, sodium, lithium) can any deviation or disappearance of maxima of light be noticed on change of temperature." In a recent paper " On the Spectra of Erbia and some other Earths,
Página 127 - In connection with this subject it may not be out of place to introduce the following extract of a letter from Prof. W. Thomson, to Prof. Kirchhoff, dated 1860. Prof. Thomson thus writes : 'Prof. Stokes mentioned to me at Cambridge