The principles underlying radio communication (1922)
United States. National Bureau of Standards, Ould, Richard Sheldon, 1889-, United States. Army. Signal Corps · Washington, Govt. Print. Off. · leaf 507
Time Seconds (a) Incoming Oscillations -Frequency f,+1 … (b) Locally Generated Oscillations at ReceivingStation - Frequency £
Telegraph, Wireless · Radio
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