Word: spectra
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Dates: during 1890-1899
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Physical Colloquium. Liebenow's Theory of the Electrical Resistance of Metals. Professor Hall.--Instantaneous photograph of Spectra. Professor Trowbridge. Jefferson Physical Laboratory, room...
Physical Colloquium. Liebenow's Theory of the Electrical Resistance of Metals. Professor Hall.--Instantaneous photograph of Spectra. Professor Trowbridge. Jefferson Physical Laboratory, room...
...method by which he has obtained a more intense source of heat than has ever been reached before. By means of it he will be able to study metals under new conditions of temperature. At present he is engaged in experimenting with gases, in the hope of obtaining spectra similar to those exhibited by the stars. With the new apparatus he has also produced x-rays of remarkable intensity and penetrating power...
...work of the United States in astronomy and all the space necessary for this exhibition will be granted. It will consist of reports from the Cambridge, Arequipa and Blue Hill observatories. Among the collection of photographs of heavenly bodies will be the stellar charts and photographs of stellar spectra produced with the aid of the great photographic telescope now in South America, the gift of Miss C. W. Bruce of New York. There also will be an exhibit of glass photography illuminated by electricity. The part that Harvard will play in astronomy at the exposition is made doubly important...
Seventeen new variable stars have been discovered by examination of the spectra contained on photographic plates taken with the Draper telescope, and twelve more variables from photographic charts. The distribution of telegraphic announcements of discovery has been continued as in past years. Astronomers are requested to continue to send to their Observatory announcements of this discoveries for transmission to the observatories of Europe and American...