It is now possible, to transmit signatures by wireless from continent to cvn\inent, the electro-magnetic waves^ travelling 186,00') miles a second No receiving Nation other than the one intended can intercept the message, because the cylinder from which the message is sent and the one on which it is received must turn at exactly the same rato of speed. The rate of speed being predetermined.. messages can be sent that will have no significance for any other receiving apparatus.
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https://paperspast.natlib.govt.nz/newspapers/CHP19220401.2.20.2
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Press, Volume LVIII, Issue 17419, 1 April 1922, Page 5
Word count
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79Page 5 Advertisements Column 2 Press, Volume LVIII, Issue 17419, 1 April 1922, Page 5
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