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alternating currents alternative apparatus British cable capacitance capacity areas claims Clifden coherer commercial communications continuous wave coupling creative damped detected detector device dipole direcdy discharge discovery distance economic Electric Waves electromagnetic waves engineers experimental experiments fact Fleming function Guglielmo Marconi Hertz Hertzian waves high frequency History induction coil innovation invention knowledge laboratory later Leyden jar light litde Lloyd's Lodge-Muirhead Lodge's patent London Marconi Company Marconi equipment matter Maxwell's theory measure ment meters Muirhead Oliver Lodge operating oscillations outputs pardy particular Poldhu possible Post Office precisely Preece Preece's problem propagation pulse pure science quency radiation radio radiofrequency radiofrequency spectrum Reginald Fessenden resonant circuits Righi scientific scientists ships signals social spark gap standing waves stations syntonic circuits syntony Telefunken tests tion transformer transmission transmitter and receiver tuned circuits velocity vertical antenna voltage wavelength wire wireless telegraphy York