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Scientific American, Vol. 89, No. 1 (1903) (1903)
leaf 3
per upon which an unwieldy and cum- seconds after the sender replaces the metallic pencil either end such elements are in number either re- bersome stylus is caused to act, a beam of light is in its rest. The amperage and voltage used in the tele- duced or increased. The mirror J is attached to a… … © 1903 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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