General Electric's revered Elihu Thomson was succeeding so well in making small quartz mirrors for telescopes that last week he reaffirmed his promise of delivering a 200-inch mirror to California Institute of Technology (Pasadena) in two or three years. It will be twice as wide and six or eight times as heavy as the Mount Wilson glass mirror (world's largest) of the Carnegie Institution. It will reflect four times as much light and probe eight times as far into space. Consequently, with it astronomers will be able to infer many new things about...
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