The work of Hertz and his successors : being a description of the method of signalling across space without wires by electric waves / by Oliver Lodge.

Signalling through space without wires : being a description of the work of Hertz & his successors / by Oliver J. Lodge.

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The work of Hertz and his successors : being a description of the method of signalling across space without wires by electric waves / by Oliver Lodge.

Signalling through space without wires : being a description of the work of Hertz & his successors / by Oliver J. Lodge.