Dodge, Mary Mapes, 1830-1905 · [New York : Scribner & Co.] · leaf 398
i discovered that electricalforce can be transmitted through earth, air,or water by means of high-frequency oscil-lations, A year later he proved that tele- graph signals could be sent and received fora distance of several miles by such waves,named Hertzian waves after their discoverer. But even… … THREE-MILE LINE OF THE FIRST TWELVE TOWERS. EACH 410 FEET HIGH WITHCROSS-ARMS, WHICH SUPPORT THE ANTENNA, 150 FEET LONG The interviewer inquired why he set thislimit, and he answered with a succinct state-ment which may serve to close this article,since it shows at once the essential…
Children's literature
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