Sure as shooting, in a big league war, there would be an almighty jam around the dials of radios which might hear propaganda and news from the other side. Hedging Italy's borders, for example, are reported about 100 small, telegraphic transmitters, some of which have lately been suspected of sending off streams of dashes to hedge off U. S. short-wave radio transmissions to Italy. Each such transmitter, radio engineers know, could be operated to transmit a "sawtooth" signal which could affect all broadcasting on a band 300 kilocycles wide (as much air space...
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