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action aerial alternating current antenna arrangement balls battery bobbin Braun capacity communication condenser conductor connected consists contact breaker corresponding cylinder decoherer described despatches detector direction disc discharge distance earth effect electric waves electrical oscillations electrodes emitted employed energy exciter experiments extremities filings galvanometer Geissler tube greater height increase induced current inducing circuit induction coil insulated intensity interrupted inventor kilometres latter Lavernock Point length Leyden jars lines of force luminous Marconi means mercury metres microphone miles millimetres obtained ordinary oscillator parallel pass period Poldhu poles potential primary produced radiations radio-telegraphy receiving apparatus receiving station relay render represented at Fig resistance resonance secondary selenium selenium receiver self-induction sending station sensibility shewn at Fig shews ship shunt signals similar sky rod Slaby spark gap spiral syntonised tele telephone tion transformer transmission transmitting apparatus traversed tube tuned ultra-violet rays variations vibrations wire wireless telegraphy yards
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