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819 Market Street April argon Astronomical Society August axis bright BURCKHALTER C. D. PERRINE California CAMPBELL changes cleveite clock College Observatory comet constellation corrected crater CROSSLEY Decl Declination determined diameter distance dome Earth east eastward eclipse EDWARD CROSSLEY equatorial error exposure February feet focal length fumaroles Greenwich groups HARVARD College Observatory helium HOLDEN hour HUSSEY hydrogen inches instrument July June Jupiter KEELER latitude LICK Observatory lunar magnitude Mars Mercury meridian circle meteor miles minutes month Moon Moon's Mount Hamilton nebular line November nucleus observations obtained October orbit Orion nebula Pacific Pacific Standard paper photographs planet plates position present Professor proper motion Publications reflector refractor Right Ascension Rises rotation San Francisco Saturn SCHAEBERLE Secretary Shadow reaches solar spectra spectroscope spectrum streamers Sun's motion surface tail telescope tion transit University Uranus variable stars velocity visible Zenith Telescope
Page 124 - Microseismic shock : recorded by a single seismograph or by seismographs of the same model, but not by several seismographs of different kinds; the shock felt by an experienced observer.
Page 124 - VI. General awakening of sleepers ; general ringing of bells ; swinging of chandeliers ; stopping of clocks ; visible swaying of trees ; some persons run out of buildings ; window-glass broken. ' 'Severe;' ' " very severe;' ' ' ' violent." VII. Overturning of loose objects ; fall of plaster ; striking of church bells ; general fright, without damage to buildings. " Nausea felt ;" "violent;
Page 195 - This confidence has not been disturbed until within a few years, when the question lias been reopened. But it has now apparently been settled upon a new and firmly established basis. Dr. Chandler's work upon this subject began with observations made by him in 1884-85, using a novel form of astronomical instrument of his own invention. These observations, continued uninterruptedly for thirteen months, revealed a progressive change of a pronounced periodical character in the instrumental values of...
Page 195 - Küstner's series was not continuous enough to show the periodic nature of the phenomenon ; but, by an exhaustive examination of the possible subjective sources of error, he clearly demonstrated that it was no longer permissible to retain the hypothesis of an invariable position of the pole, and he recommended that properly organized observations at various places be instituted to settle the question definitely. It was doubtless this work of Küstner's which compelled the attention of astronomers...
Page 194 - NYREN repeated the determination, in connection with his observations for the determination of the constant of aberration. These observations, made with the prime-vertical transit, were carried through with the minutest attention, and the utmost care to avoid every conceivable source of error. Curious discordances were nevertheless found in the results for the constant of aberration.
Page 197 - ... revolution ; but whether they are the result of real changes in the form and dimensions of the ellipse, or the effect of an apsidal motion of long period, cannot at present be determined from the observations available. All that can be said is that observations during five years show that the line of apsides is either fixed, or, if variable, revolving only at a very slow rate. 6.
Page 321 - The gas from cleveite also showed hydrogen lines dimly, probably through not having been filled with completely dried gas. On comparing the two spectra, I noticed at once that while the hydrogen and argon lines in both tubes accurately coincided, a brilliant line in the yellow, in the cleveite gas, was nearly but not quite coincident with the sodium line D of the argon-tube. Mr. Crookes was so kind as to measure the wave-length of this remarkably brilliant yellow line.
Page 346 - HARVARD COLLEGE OBSERVATORY, CIRCULAR NO. 2. VARIABLE STAR CLUSTERS. PROFESSOR SOLON I. BAILEY, in charge of the station at Arequipa, maintained by this Observatory, has discovered from an examination of the photographs obtained by him of certain globular clusters that they contain an extraordinary number of variable stars.
Page 196 - Earth's surface is in motion about a mean position, in a period of a year. Its direction is also from west to east, but is in an ellipse, three or four times as long as broad, the major and minor axes being about twenty-five feet and eight feet respectively. The major axis is inclined at present, by about 45° to the Greenwich meridian. The motion is central, obeying the law of proportionality of times to areas described by the radius vector about the center of the ellipse. 4. Both the radius and...
Page 320 - April 251(1, 1893. over mercury, and the oxygen absorbed by potassium pyrogallate ; the gas was removed, washed with a trace of boiled water, and dried by admitting a little sulphuric acid into the tube containing it, which stood over mercury. The total amount was some 20 cc Several vacuum-tubes were filled with this gas, and the spectrum was examined, the spectrum of argon being thrown simultaneously into the spectroscope. It was at once evident that a new gas was present along with argon. Fortunately,...