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Scientific American, Vol. 40, No. 1 (1879) (1879)
leaf 4
are made phosphates. Fig. 1—THE RAPIEFF ELECTRIC LIGHT. slowly to approach each other, so that the arc is The poisonous nature of zinc salts, even in always of the same width, and keeps its fixed small doses, renders the above research of more than ordinary practical interest. together over small… … tration increase. Fig. 3—MODIFIED FORM OF RAPIEFF LAMP. © 1879 SCIENTIFIC AMERICAN, INC.Internet Archive · Public domain (published before 1931). Free to use for anything.
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