Spectrum Analysis in Its Application to Terrestrial Substances, and the Physical Constitution of the Heavenly Bodies: Familiarly Explained by Dr. H. Schellen, Tr. from the 2d Enl. and Rev. German Edition by Jane and Caroline LassellLongmans, 1872 - 662 pages |
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Common terms and phrases
absorption angle Ångström apparatus appear atmosphere bands blue bodies bright bands bright lines brilliant Bunsen burner carbon points chromosphere coincident collimating lens coloured rays combustion comet continuous spectrum corona dark lines direct-vision direction disk displacement distance earth electric spark emitted employed ether F-line faint flame Fraunhofer lines gases glass glowing green heat Huggins hydrogen gas hydrogen lines incandescent inch induction instrument intense investigations Kirchhoff lamp lens liquid Lockyer luminous magnesium means metal meteors millimetre motion Nebula observed oxygen oxyhydrogen oxyhydrogen flame particles pass phenomena photographic photosphere placed plate platinum portion position prism produced prominences refraction refrangibility screen screw Secchi seen slit sodium sodium line Solar Eclipse solar prominences solar spectrum Solar Spot spec spectra spectroscope spectrum analysis stars substance sun's limb surface telescope temperature tion trum tube vapour vibrations violet visible volatilized wave-length white light wires yellow Zöllner
Popular passages
Page 423 - 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.
Page 229 - In the year 1860, he published his memoir on the relation between the emissive and absorptive powers of bodies for heat, as well as for light, in which occurs the celebrated sentence : " The relation between the power of emission and the power of absorption of one and the same class of rays, is the same for all bodies at the same temperature...
Page 640 - The meteors to which we owe the annual display of falling stars on the loth of August are not distributed equally along the whole course of their orbit ; it is still possible to distinguish the agglomeration of meteoric particles which originally formed the cometary nucleus from the other less dense parts of the comet; thus in the year 1862, the denser portion of this...
Page 83 - Dove describes, in his own ingenious manner, the course of the vibrations as they produce successively sound, heat, and light, as follows : — " In the middle of a large, darkened room let us suppose a rod, set in vibration and connected with a contrivance for continually augmenting the speed of its vibrations. I enter the room at the moment when the rod is vibrating four times in a second. Neither eye nor ear tell me of the presence of the rod, only the hand, which feels the strokes when brought...
Page 476 - A had entirely disappeared ; not even the slightest rack appeared in its place : whether it was entirely dissipated, or whether parts of it had been wafted towards the other part, I do not know, although I think the latter explanation the...
Page 163 - ... suggest that at the lower temperature of the flame or weak spark, the spectrum observed is produced by the glowing vapour of some compound, probably the oxide, of the difficultly reducible metal ; whereas at the enormously high temperature of the intense electric spark these compounds are split up, and thus the 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 the maxima of light...
Page 418 - ... as consisting of separate rays, others give to it an almost true geometrical contour; in some of the Spanish sketches a tendency to assume a roughly quadrangular form can be detected, while in most of the Sicilian drawings there is a tendency to an annular form. We pass to the spectroscopic observations of the corona and halo. . Prof. Winlock, using a spectroscope of two prisms on a five and a half inch achromatic, found a faint continuous spectrum. Of the bright lines, the most persistent was...
Page 530 - ... may be inferred that the planet is surrounded by a dense mist of considerable extent, the chemical nature of which has yet to be discovered, or else that, like Jupiter, Saturn, and Uranus, it has not yet attained that degree of density which must necessarily precede the formation of a solid surface. SPECTRA OF THE FIXED STARS. The fixed stars, though immensely more remote, and less conspicuous in brightness than the moon and planets, yet from the fact of their being original sources of light,...