Word: prisms
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...known among scholars, and he has the hustling qualities of a business man as well. He was the first American to traverse the Arab state and he encountered real risks in the journey. But he has his reward for chief among the finds he announces is a six-sided prism containing an Assyrian account of the destruction of the army of Sennacherib, a record which may solve one of the puzzles of the Old Testament history...
...would injure certain channels of the harbor, but in opposition to this contention several of the most eminent engineers of the state have expressed the opinion that the tidal scour theory has no application to the conditions which exist in those channels of Boston Harbor over which the tidal prism of the Charles river Basin moves...
There are two other stationary instruments. Over the end of one a prism is placed, which breaks up the light of the stars so that by the study of the rays the composition and character of any one star may be accurately determined. The second instrument is regulated by two ordinary alarm clocks, which open and close the shutter at any time the operator may wish. Every night this telescope is pointed directly at the north star, and after an exposure of twelve hours a semi-circle is thus traced on the plate. By this device an impression...
...photographs of the spectra of the stars taken at the Harvard College Observatory as part of the Henry Draper Memorial differ in two respects from those ordinarily taken elsewhere. Instead of using a spectroscope with a slit, in which but one star is photographed at a time, large prism is placed over the object glass of the telescope and thus spectra of all the bright stars in the field of view are obtained. The number of stars photographed simultaneously is still further increased by substituting for the object glass a portrait lens like that used by photographers, only larger...
...disks of glass for the projected Bruce photographic telescope have not yet been received from France, but the disk for the prism has been received and seems to be unusually free from defects. The important gift by Miss Bruce of six thousand dollars, to be distributed among astronomers of all nations should here be mentioned. It affords an example of using money so as to secure the greatest scientific return, which, it is hoped, will find many imitators...