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 páginas |
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Términos y frases comunes
absorption angle Ångström apparatus appears aqueous vapor atmosphere blue bodies bright bands bright lines brilliant Bunsen Bunsen burner burner carbon carbon-points chromosphere coincident collimating lens colored rays comet continuous spectrum corona dark lines direct-vision direction displacement distance earth emitted F-line faint flame Fraunhofer lines gases glass green heat Huggins hydrogen gas hydrogen lines incandescent inch incident ray instrument intensity investigations Kirchhoff lamp lens liquid Lockyer luminous magnesium means metal meteors millimetre motion Nebula observed oxygen oxyhydrogen oxyhydrogen flame particles pass penumbra phenomena photographic photosphere placed plate portion position prism produced Prof prominences rays of light 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 umbra vibrations violet visible wave-length white light wires yellow Zöllner
Pasajes populares
Página 345 - 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.
Página 143 - D of the solar spectrum with the double bright line constituting the spectrum of the spirit-lamp burning with salt. I remarked that there must be some physical connexion between two agencies presenting so marked a characteristic in common. He assented, and said he believed a mechanical explanation of the cause was to be had on some such principles as the following : — Vapour of sodium...
Página 420 - Sons. manship of this celebrated firm, and has an aperture of 94 inches, with a focal length of 12 feet. In the table the first column contains simply the reference number. An asterisk denotes that the line affected by it has no well-marked corresponding dark line in the ordinary solar spectrum.
Página 399 - ... 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 ring of meteors through which the Earth passes annually on the 10th of August, and which causes the display of falling stars, was seen in the form of a comet with head and tail, as the densest parts approached the Sun and Earth, in the course of that month.
Página 257 - If these bodies are gaseous, their spectra would consist of bright lines. With a powerful spectroscope, the light reflected from our atmosphere 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 i Proc. Roy. Soc., April 14, 1869, vol. xvii. p. 415. carried out by various forms of prismatic apparatus, and also by other contrivances,...
Página 442 - POLITICS, TRAVELS, CHEMISTRY, MECHANICS, INVENTIONS, and TRADES. Abstaining from all doctrinal discussions, from all sectional and sectarian arguments, it will maintain the position of absolute impartiality on the great controverted questions which have divided opinions in every age.
Página 143 - ... 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 vapour of sodium, which, according to the 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.
Página 385 - I could detect the light of the coma to consist; almost entirely of three bright bands. A fair measure was obtained of the centre of the middle band, which •was the brightest ; it gives for this band a wave-length of about 510 millionths of a millimetre. I was not able to do more than estimate roughly the position of the less refrangible band.
Página 281 - ... which total eclipses have revealed to us in the sun's atmosphere ; although they escape all other methods of observation at other times? and if so, may we not learn something from this of the recent outburst of the star in Corona ? IV.
Página 399 - August has been formed in the course of time. " The difference between the comet's nucleus and its tail that has now been formed into a ring, consists in that while the denser meteoric mass forming the head approaches so near the Earth once in every...