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Parole e frasi comuniabsorption afterglow amount angle angular aperture appear ASTROPHYSICAL JOURNAL atmosphere band benzene bolometer bright camera collimator collimator lens comparison copper corona correct correcting lens curve Darkened Deslandres determined discharge dispersion Displaced to violet eclipse effect electrodes errors exposure faint gases given grating helium hydrogen inch increase inductance intensity International investigation Kayser lens Lick Observatory light longueurs d'onde magnitude maximum means measurements metallic method micrometer molecules Moon motion nebula negative nitrogen observed obtained oscillations pairs parallax particles periastron photographs plates possible present prisms probably Professor radial velocity radiation rays reduced region relative Rowland's seems self-induction silver bromide slit slit-width solar spectrum spark lines spectra spectrograph spectroscope standards star stellar strong strongest at poles Sun-spot tail telescope temperature tenth-meters tion tube values vapor variable wave-lengths Yerkes Observatory ytterbium yttrium Brani popolariPagina 155 - ROWLAND'S solar tables. It is doubtful if the conditions of density and internal motion in the Sun and spark are sufficiently alike to warrant this procedure. But until better determinations of spark wave-lengths are available, there seems to be no alternative. A careful discussion of the matter by FROST and ADAMS* has led to the conclusion that " In 'the present state of our knowledge we ... cannot say with any certainty how much our results are affected by the use of solar wave-lengths for our... Pagina 314 - Preliminary Table of Solar Spectrum Wave-Lengths," expecting, as he says, " to add to it and correct it for a term of years until I can publish a standard list of the lines of the solar spectrum with all the elements to which they belong. Pagina 228 - KH1 to 10-* earth mass). The situation turns out to be completely different in the region of outer planets. The initial masses of the concentrations are inversely proportional to the sixth power of the distance from the Sun, and were only 5 orders of magnitude less than the mass of Neptune in the zone of Neptune. On the other hand, the initial densities of the concentrations (on the order of the Roche density) in the zone of Neptune were 3 X 104 less than in the zone of Earth, and therefore, to convert... Pagina 302 - Magnetism and Atmospheric Electricity of the International Meteorological Committee be invited to appoint a committee to co-operate with the Solar Research Committee. This motion was seconded by Mr. Rotch and adopted. Professor Turner moved: That the Hungarian Academy of Sciences of Budapest also be invited to appoint a committee to co-operate with the Solar Research Committee. This miltion was seconded by Professor Frost and adopted. Pagina 186 - ... that the system is pervaded by a resisting medium which enhances the brightness of that side, of the star which faces the direction of motion, put forward by Dr. Pagina 217 - ... that is to be ascribed to errors in reading the curves as well as to the fact that the small spectrometer was used, and that in general it was not practicable to make the examinations in the manner just described. A shift of .02 ft was easily observed in the bands of xylene and mesitylene at 3.4^. Pagina 210 - I mm. thick, and hence easily bent to fit the cell, thus preventing evaporation. This form of cell is much better than that used in previous investigations, in that it can be thoroughly cleaned, while a new tin-foil ring was used for each new compound. A block of wood having an opening cut in it, over which the rocksalt cell was securely mounted, was placed in vertical ways before the spectrometer slit. The radiation from the Nernst heater passed through the opening in the block and through the rock... Pagina 221 - Illustrating the persistence of the benzene bands at 3.25^1 and 6.75^ in the spectra of its derivatives. Considering the bands of ammonia and of the compounds containing NH2, or certain ones containing nitrogen, the coincidence appears to be somewhat accidental. Farther in the infra-red we have numerous cases of the coincidence of absorption bands. As a whole the most definite conclusion we can draw, at present, is that the alcohols have a characteristic band at about 2.95 /-i just as the band at... Pagina 65 - ... probably helped to give the repulsion. However, a rigid application of the theory of Maxwell is possible only when the body acted upon is large compared with the vibrations of light itself. When the body is of a size approximating the wave-length of light, Schwarzschild 2 has shown that the maximum value of the repulsive force is about twenty times the attraction of gravity. Pagina 301 - That the committee on solar research be made a standing committee of the Academy. REPORT OF THE COMMITTEE ON SOLAR RESEARCH OF THE NATIONAL ACADEMY OF SCIENCES. The committee on solar research respectfully submits the following report: The committee was appointed at the. Informazioni bibliografiche
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