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Chapter 15 TELEGRAPHING WITHOUT WIRES
The First Suggestion-Morse Sends Messages Through the
Water-Trowbridge Telegraphs Through the Earth-Experiments of
Preece and Heaviside in England-Edison Telegraphs from Moving
Trains-Researches of Hertz Disclose the Hertzian Waves.
Great as are the possibilities of the telegraph and the telephone in the service of man, these instrument
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