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Scientific American, Vol. 58, No. 7 (1888) (1888)
leaf 4
f this spread among physiologists, that it consists in speaking light is not sufficiently intense, but these forges emit a character have not hitherto been considered available. while inspiring, and without the cavity of the mouth light of more than 100,000 candles from a few square It gives the… … action of an intense light. volume of air expired was considerably © 1888 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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