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aboard Admiralty airborne aircraft Alexandra Palace amplifier antenna antenna system Atlantic Baddow became Britain British broadcasting C. S. Franklin cable Cable and Wireless camera capacitor carried Chelmsford circuit Clifden commercial Company's considerable contract demonstration device direction-finding Division Eckersley electronics English Electric established experimental experiments Fleming frequency further German Glace Bay Godfrey Isaacs Government ground stations Guglielmo Marconi H. J. Round Hertz high-power improved installation interest ionosphere Italian laboratory large number later London manufacture Marconi Company Marconi engineer Marconi House Marconiphone Marine masts ment messages miles Navy organization patent Poldhu Post Office production programme radar radiated radio range received ship short-wave signals spark speed success technical Telefunken Telegraph television tests thermionic valve tion traffic transatlantic transmission transmitter tube tuning vessels wavelength waves wire wireless apparatus wireless communication wireless stations wireless telegraphy wireless telephony