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absorption April Astronomical Society atmosphere August binary stars bright Bruce Medal California cents Comet-Medal Committee Committee—Messrs components craters CROCKER CURTIS D. O. Mills D. S. RICHARDSON Directors distance double stars Earth eccentricity eclipse Expedition faint fainter flocculi Folio Fund HALE Halley's Comet hour instrument interest investigation January June LIBRARY Lick Observatory light lines magnitude March March 27 Mars mass measures Mills Expedition MOLERA Moon motion Mount Hamilton Mount Whitney Mount Wilson nearly nebulae nights November nucleus observations obtained orbit Pacific Paper period photographs planet plates polarity position Prof Professor Publications quarter R. G. AITKEN radial velocity rotation San Fran San Francisco satellites Secretary September Solar Observatory spectra spectral type spectrograph spectroscopic binary spectrum spot stellar steps Sternwarte streamers sun-spots Sun's tail telescope tion TOWNLEY University variable stars W. W. CAMPBELL water vapor Yerkes Observatory
Page 142 - On the evening of August 29, 1864, I directed my telescope for the first time to a planetary nebula in Draco. The reader may now be able to picture to himself to some extent the feeling of excited suspense, mingled with a degree of awe, with which, after a few minutes of hesitation, I put my eye to the spectroscope. Was I not about to look into a secret place of creation ? "I looked into the spectroscope.
Page 136 - Then it was that an astronomical observatory began, for the first time, to take on the appearance of a laboratory. Primary batteries, giving forth noxious gases, were arranged outside one of the windows ; a large induction coil stood mounted on a stand on wheels so as to follow the positions of the eye end of the telescope, together with a battery of several Leyden jars ; shelves with Bunsen burners, vacuum tubes, and bottles of chemicals, especially of specimens of pure metals, lined its walls.
Page 145 - This band in both spectra remained of nearly equal brightness for the same proportion of its length. On a subsequent evening, June 25, I repeated these comparisons, when the former observations were fully confirmed in every particular. On this evening I compared the brightest band with that of carbon in the larger spectroscope, which gives a dispersion of about five prisms. The remarkably close resemblance of the spectrum of the comet to the spectrum of carbon necessarily suggests the identity of...
Page 232 - A special meeting may be called by the President, or, in his absence or disability, by one of the Vice-Presidents, or, in the absence or disability of both the President and the Vice-Presidents, by the Secretary, on the written requisition of ten active or life members ; and the object of such meeting shall be stated in the notice by which it is called. The annual election shall be held on the day of the annual meeting, between the hours of 8 : 1 5 and 9 p.
Page 181 - The fourth conference of the International Union for Cooperation in Solar Research was held at the Mount Wilson Solar Observatory, August 31 to September 2, 1910.
Page 139 - The modern silver-bromide gelatine plate, except for its grained texture, meets the needs of the astronomer at all points. It possesses extreme sensitiveness ; it is always ready for use ; it can be placed in any position ; it can be exposed for hours ; lastly, it does not need immediate development, and for this reason can be exposed again to the same object on succeeding nights, so as to make up by several instalments, as the weather may permit, the total time of exposure which is deemed necessary.
Page 141 - I will let him speak in his own words : — " 'A shining fluid of a nature unknown to us. " 'What a field of novelty is here opened to our conceptions ! ... We may now explain that very extensive nebulosity, expanded over more than sixty degrees of the heavens, about the constellation of Orion; a luminous matter accounting much better for it than clustering stars at a distance. . . . " 'If this matter is self-luminous, it seems more fit to produce a star by its condensation than to depend on the...
Page 142 - ... now condensed into the sun and planets filled the whole space occupied by the solar system, In the condition of gas, which then appeared as a glowing nebula, after the order, it may be, of some now existing in the heavens. There remained no room for doubt that the nebulae, which our telescopes reveal to us, are the early stages of long processions of cosmical events, which correspond broadly to those required by the nebular hypothesis in one or other of its forms.
Page 85 - STELLAR MOTIONS. With Special Reference to Motions Determined by Means of the Spectrograph. By WILLIAM WALLACE CAMPBELL, Sc.D., LL.D., Director of the Lick Observatory, University of California.
Page 137 - Fraunhofer in 1815, by whose name the dark lines are still known, not only to map some six hundred of them, but also to discover similar lines, but differently arranged, in several stars. Further, he found that a pair of dark lines in the solar spectrum appeared to correspond in their position in the spectrum, and in their distance from each other, to a pair of bright lines which were nearly always present in terrestrial flames. This last observation contained the key to the interpretation of the...