SPECTRUM ANALYSIS, IN ITS APPLICATION TO TERRESTRIAL SUBSTANCES, AND THE PHYSICAL CONSTITUTION OF THE HEAVENLY BODIES1872 |
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Common terms and phrases
absorption angle Ångström appears atmosphere bands blue bright bands bright lines brilliant Bunsen Bunsen burner carbon carbon-points chromosphere coincident collimating lens colored rays comet continuous spectrum corona dark lines direct-vision direction dispersive power displacement earth Eclipse of August emitted eye-piece F-line faint flame Fraunhofer lines gases glass glowing green heat Huggins hydrogen gas hydrogen line incandescent inches instrument intense investigations Janssen Kirchhoff lamp lens line H liquid Lockyer luminous magnesium means metal meteors millimetre moon motion Nebula object-glass observed oxygen oxyhydrogen oxyhydrogen flame particles pass phenomena photographic photosphere placed plate portion position prism Prof prominences refraction refrangibility screen Secchi seen slit sodium sodium line Solar Eclipse solar spectrum Solar Spot spec spectra spectroscope spectrum analysis stars substance sun's disk sun's limb surface telescope temperature tion Total Solar Eclipse trum tube umbra vapor vibrations violet visible wave-length white light wires yellow
Popular passages
Page 263 - 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 337 - 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, furnish us with fuller indications of their nature. In all ages, and among every people, the stars have been the object of admiring wonder, and not unfrequently of superstitious adoration. The greatest investigators and the deepest thinkers who have devoted themselves to the study of the stars, have felt...
Page 175 - As far as could be judged, during this brief interval every non-atmospheric line of the solar spectrum showed bright ; an interesting observation confirmed by Mr. Pye, a young gentleman whose voluntary aid proved of much service. From the concurrence of these independent observations we seem to be justified in assuming the probable existence of an envelope surrounding the photosphere, and beneath the chromosphere, usually so called, whose thickness must be limited to two or three seconds of arc,...
Page 103 - ... 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 be noticed on change of temperature...
Page 446 - This paper gives the wave-lengths of the principal lines of the Solar Spectrum. On Wave-lengths. Silliman's Journal, March 1869. GLADSTONE, JH Notes on the Atmospheric Lines of the Solar Spectrum, and on certain Spectra of Gases.
Page 175 - ... at the moment of obscuration, and for one or two seconds later, the field of the instrument was filled with bright lines. As far as could be judged, during this brief interval every non-atmospheric line of the visible spectrum showed bright, an interesting observation confirmed by Mr. Pye.
Page 59 - ... is 474,439,680,000,000. 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.
Page 417 - It was only in its last revolution, in the year 1866, that this meteoric cloud, now forming part of our solar system, was first seen as a comet. The orbit of this comet is much smaller than that of the August meteors, extending at the aphelion as far as the orbit of Uranus, while the perihelion is nearly as far from the sun as our earth. The comet completes its revolution in about...
Page 361 - Klein have expressed the opinion that the sudden blazing out of a star might be occasioned by the violent precipitation of some great mass, perhaps of a planet, upon a fixed star, by which the momentum of the falling mass would be changed into molecular motion, or, in other words, into heat and light.
Page 259 - ... 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 1474 Kirchhoff. This bright line, and the continuous...