I looked into the spectroscope. No spectrum such as I expected ! A single bright line only ! At first I suspected some displacement of the prism, and that I was looking at a reflection of the illuminated slit from one of its faces. This thought was scarcely... Annual Report of the Board of Regents of the Smithsonian Institution - Page 310 by Smithsonian Institution. Board of Regents - 1911 Full view -
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