Word: spectrum
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Dates: during 1890-1899
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...very successful. There is in the observatory a library, so to speak, of the sky for the past eight years. During this time nearly 60,000 photographs of the skies at differet times have been taken. As soon as a star is noticed with hydrogen lines on its spectrum, a reference is immediately made to the photpraphs made in that region where the star is found. From these different photographs it can be learned whether the star is always of the same brightness. This method leads to the discovery of more variable stars here than in any other place...
...interesting discoveries. They took 2777 stellar photographs in Cambridge and nearly 2000 in Peru. By means of these no less than seven new variable stars have been discovered, and the number of stars of the fifth type has been increased by eight, making the total number forty-five. The spectrum of the nebula surrounding some of the stars is unlike that of any other gaseous nebula...
...equator. Spectrit of stars as faint as the tenth magnitude have been obtained and umerous is important results obtained. The most interesting result has been the discovery by Miss Maury of a second star, Beta Aurigael, which is shown by the doubling of the lines in its spectrum at regular intervals to be a close binary, revolving once in about four days. The study of the star of this class previously known. Zeta Ursae M joris, has been continued...
...work done here on the Southern stars. Peru is sufficiently far south to get a comprehensive view of the southern stars, and, moreover, being a country with little rain, has a very clear atmosphere. Two new instruments will be carried down, one to photograph a map and the spectrum of the stars, the other to measure their brightness. Photographs will also be taken of clusters and double stars. The expedition will remain there for two years or more; and special preparations will be made to observe an eclipse of the sun which takes place in the spring...
Physics A. (Course for freshmen). Light, with especial reference to Spectrum Analysis. Professor Trowbridge. Jefferson Physical Laboratory...