Word: prisms
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Dates: during 1920-1929
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...spectrum of a star, revealed by passing its light through an objective prism, shows of what material it is composed, such a catalogue is of fundamental importance to astronomers. The Draper Catalogue, containing as it does vast numbers of these spectra, is constantly used for reference in observatories. It consists of nine volumes. Seven of these have been published to date, and meanwhile the Observatory furnishes yearly to the astronomers of all countries upon request hundreds of spectra contained in the unpublished volumes...
...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...