Other editions - View all
absorption angle Ångström appears atmosphere blue bodies bright bands bright lines brilliant Bunsen Bunsen burner carbon chromosphere cloud coincident collimating collimating lens colored rays comet consists continuous spectrum corona dark lines direct-vision direction dispersive power displacement earth earth's atmosphere emitted eye-piece F-line faint flame Fraunhofer lines gases glass green heat Huggins hydrogen gas hydrogen line incandescent inches instrument intensity investigations Janssen Kirchhoff lens liquid Lockyer luminous means metal meteors miles millimetre moon motion nebula nitrogen nucleus object-glass observed orbit pass penumbra phenomena photographic photosphere plate portion position prism Prof prominences refraction refrangibility screen screw Secchi seen Sirius slit sodium sodium line solar eclipse solar prominences solar spectrum solar spots spec spectra spectroscope spectrum analysis stars stellar substance sun's limb surface system of prisms telescope temperature terrestrial tion trum tube umbra violet visible wave-length white light yellow Zöllner
Page 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.
Page 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...
Page 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.
Page 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.
Page 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,...
Page 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.
Page 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.
Page 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.
Page 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.