The Astrophysical Journal, Volumul 5University of Chicago Press, 1897 "Letters to the Editor" issued as Part 2 and separately paged from v. 148, 1967. |
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29 Canis Majoris absorption aperture apparatus ASTROPHYSICAL JOURNAL atmosphere axis bolometer bright carbon Character Wave-length Substance chromosphere color comet corona crater curve determined diameter Diffuse disk distance E. E. BARNARD eclipse effect electric electro-magnet experiments exposure focal length focus formula Geissler tube glass heliostat hydrogen hydrogen lines inches index of refraction instrument Intensity and Character Intensity Wave-length Substance investigations Jour Lick Observatory light lines magnetic means measures method Micrometric mirror motion mounted nebula negative objective observations obtained paper photographic Photometry photosphere plane plate polar position pressure prism Proc Professor radiation reflecting telescope reflection reflector refraction refractor rutile slit solar spectra spectroheliograph spectroscopic spectrum spot star stellar Substance and Character surface telescope temperature thickness tion tube vapor Variable Stars velocity vibrations visual Wave-length Substance Intensity waves wire YERKES OBSERVATORY
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Pagina 63 - Such a view may perhaps reconcile the high temperature which the nebular spectrum undoubtedly suggests with the much lower mean temperature of the gaseous mass, which we should expect at so early a stage of condensation, unless we assume a very enormous mass, or that the matter coming together had previously considerable motion, or considerable molecular agitation.
Pagina 338 - 1862 was the last year of experimental research. STEINHEIL'S apparatus for producing the spectrum of different substances gave a new method by which the action of magnetic poles upon light could be tried. In January he made himself familiar with the apparatus, and then he tried the action of the great magnet on the spectrum of chloride of sodium, chloride of barium, chloride of strontium, and chloride of lithium.
Pagina 333 - In this theory it is assumed that in all bodies small electrically charged particles with a definite mass are present, that all electric phenomena are dependent upon the configuration and motion of these "ions," and that light- vibrations are vibrations of these ions.
Pagina 63 - On account of the large extent of the nebulae, a comparatively small number of luminous molecules or atoms would probably be sufficient to make the nebulae as bright as they appear to us. On such an assumption the average temperature may be low, but the individual particles, which by their encounters are luminous, must have motions corresponding to a very high temperature, and in this sense be extremely hot.
Pagina 330 - When the electromagnet was put on, the absorption-lines immediately widened along their whole length. Now the explanation in the manner of §8 fails. 10. I should like to have studied the influence of magnetism on the spectrum of a solid. Oxide of erbium has, as was found by Bunsen or Bahr, the remarkable property of giving by incandescence a spectrum with bright lines. With the dispersion used, however, the edges of these lines were too indistinct to serve my purpose. 11. The different experiments...
Pagina 341 - The negative result obtained by Fievez with absorption-spectra would without further consideration (as in § 12) point in the same direction. The inference to be drawn from Fievez's experiments alone would rather be, I think, that the .temperature of the flame is changed in his experiments than that a specific action of magnetism on the emission and absorption of light exists. By experiments already in progress I hope to settle the dubious points. Summarizing, we may say : Had the experiments of...
Pagina 326 - I attempted to illustrate to myself the possibility of this is of minor importance at present,! at any rate I was induced thereby to try the experiment. With an extemporized apparatus, the spectrum of a flame, coloured with sodium, placed between the poles of a Ruhmkorff electromagnet, was looked at. The result was negative. Probably I should not have tried this experiment again so soon had not my attention been drawn some two years ago to the following quotation from Maxwell's sketch of Faraday's...
Pagina 339 - The planepolarized ray is broken up, while in the medium, into its circularly polarized components, one of which rotates with the ether so as to have its period accelerated, the other against it in a retarded period. Now, suppose the medium to absorb one definite wave-length only, then — if the absorption is not interfered with by the magnetic action — the portion absorbed in one ray will be of a shorter, in the other of a longer, period than if there had been no magnetic force ; and thus, what...
Pagina 248 - The Yerkes Observatory of the University of Chicago. II. The Building and Minor Instruments. Id. April. 1897. The Yerkes Observatory of the University of Chicago. III. The Instrument and Optical Shops, and the Power House. Id. May. 1897. Review of " Analyse Spectrale Directe des Mineraux,
Pagina 342 - ... also be remembered that water is a constituent of tourmaline, which favours the idea of its being a secondary product. t Sir H. De la Beche op : cit. p. 160, regards the schorl as, at any rate in many cases, a secondary product, though he does not appear to have considered the details of the question. Since the above was written my attention has been called to a notice in the Comptes Eendus for 1864, by M. Pisani (p. 913). He regards Luxullianite as an altered granite and states that tourmaline...