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Scientific American, Vol. 86, No. 21 (1902) (1902)
leaf 4
- The exhibit made by the ScientTIFIC AMERICAN at the phony dated from his invention of an earth cell sev- ceiver. Upon placing his ear to the receiver, Prof. Paris Exposition in Group 3, Class 13 of American eral years ago. . This cell derived sufficient electrical Bell was surprised to hear quite… … importance in facjlitating the opening of communica- tion- © 1902 SCIENTIFIC AMERICAN, INCInternet Archive · Public domain (published before 1931). Free to use for anything.
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