Comentarios de la gente - Escribir un comentario
No encontramos ningún comentario en los lugares habituales.
Otras ediciones - Ver todas
absorb absorption angle Angstrom apparatus appear aqueous vapour atmosphere blue body bright bands bright lines brilliant Bunsen Bunsen burner carbon chromosphere coincidence collimating lens coloured rays comet continuous spectrum corona dark bands dark lines direct-vision direction dispersive power displacement earth earth's atmosphere electric emitted ether waves F-line faint flame Fraunhofer lines gases glass green heat Huggins hydrogen gas hydrogen lines inches incident ray instrument intensity investigations Janssen Kirchhoff lamp lens line H liquid Lockyer luminous magnesium means metals meteors millimetre moon motion nebula nucleus observed oxygen oxyhydrogen flame pass penumbra phenomena photographic photosphere placed plate portion position prism produced prominences refraction refrangibility screen screw Secchi seen slit sodium line sodium vapour Solar Eclipse solar spectrum solar spots spark 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
Página 195 - 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...
Página 564 - ... 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. The result gives 545 millionths. The third band was situated at about the same distance from the middle band on the more refrangible side. It would appear that this comet is similar in constitution to the comets which I examined in 1868*....
Página 367 - 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.
Página iii - SCHELLEN'S SPECTRUM ANALYSIS, in its application to Terrestrial Substances and the Physical Constitution of the Heavenly Bodies. Translated by JANE and C. LASSELL; edited, with Notes, by W. HUGGINS, LL.D. FRS With 13 Plates (6 coloured) and 223 Woodcuts. 8vo. price 28s. CELESTIAL OBJECTS for COMMON TELESCOPES.
Página 615 - Kirchhoff's map, determined by direct comparison with the map at the time of observation. In some cases an interrogation mark is appended, which signifies not that the existence of the line is doubtful, but only that its precise place could not be determined, either because it fell in a shading of...
Página 194 - In connexion 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 : — ' Professor Stokes mentioned to me at Cambridge some time ago, probably about ten years, that Professor Miller had made an experiment testing to a very high degree of accuracy the agreement of the double dark line D of the solar spectrum with the double bright line...
Página 135 - Bunsen flame or a weak spark, the spectrum observed is produced by 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 maxima of light be noticed on change of temperature.
Página 632 - 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.
Página 362 - ... 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...
Página 617 - I would call especial attention to the lines numbered 1 and 82 in the catalogue; they are very persistently present, though faint, and can be distinctly seen in the spectroscope to belong to the chromosphere as such, not being due, like most of the other lines, to the exceptional elevation of matter to heights where it does not properly belong. It would seem very probable that both these lines are due to the same substance which causes the DJ line.