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adjusted aerial alternating current amplifying anode apparatus ascertained the nature audion battery British Patent capacity areas cathode coherer COMPLETE SPECIFICATION condenser conducting member connected contact or contacts continuous current declare the nature described and ascertained direct current discharge distance earth effect electric arc electric currents electric waves electrical oscillations electrodes Elihu Thomson employed energy evacuated vessel filament grid circuit Hertz Hertzian wave high frequency impulses induction coil insulated invention relates LEE DE FOREST low frequency manner Marconi Company means mentioned in Claim metallic method mentioned obtained oscillation circuit oscillation detector parabolic reflector particularly described present invention produced radiator radio receiving instrument receiving system reference relay resonance secondary self-inductance coil sensitive tube sets of rods shown in Fig source of direct spark gap strengthened substantially as described suitable syntonized telegraphy and telephony telephone terminals transformer transmitting triode tuned vacuum tubes varying or alternating vibrations whereby wing circuit wire wireless telegraphy