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Scientific American, Vol. 97, No. 19 (1907) (1907)
leaf 21
fore is ex- rect current, of 110 volts, by the usual flexible cord tremely valuable for the development of the germ, from above through the double window in the lid of and plug. It is only necessary to turn the button, any excess of ventilation will prove detrimental; in the apparatus. Both… … © 1907 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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