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Scientific American, Vol. 84, No. 8 (1901) (1901)
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endicular to the level of There was much music to be heard. at the Exposi- light radiations and not to other causes. A lamp the oil in the oil container, since it could not be readily tion of 1900, but the most original was, without any of 50 candle power provided with a silvered parabolic made to… … vinced that the luminous rays may be. © 1901 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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