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Scientific American, Vol. 89, No. 23 (1903) (1903)
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o the lines more or tess firmness, +8 PHOTOGRAPHY BY ELECTRIC DISCHARGES. The Franklin electric blue-print machine, manufac- according to their fineness and density; the most com- M. Stephan Leduc, professor of biological physics tured by Williams, Brown & Earle, of Philadelphia, pact powders give… … THE FRANKLIN BLUE-PRINTING MACHINE. © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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