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Improved sparkgap detectors
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acid adjustment aerial and earth aerial current alternating current apparatus arrangement audible battery Branly British Patent 17 capillary carrier caused cell circuit connected crystal current flowing decoherence decohering deflection demagnetisation device diaphragm diode direct current disc dots ECCLES Edouard Branly effect Electrical World Electrician Electrique electrodes electrolytic detectors Fessenden filings coherer film Fleming flux frequency galvanometer glass tube heating Hertzian heterodyne History of radio hysteresis detector illustrated in Fig insulating iron loop magnetic field magnetisation Marconi mercury metal mounted movement needles operation oscillations oscillatory current oxide particles plate platinum Proc produced pulse radio telegraphy rectifier Reference relay resistance rotating Science Museum photograph search coil sensitive shown in Fig solenoid spark spark-gap specimen steel tantalum telegraphy and telephony telephone earpiece telephone receiver telephony Chapman thermal detectors thermocouple thin ticker TOMMASINA transmitter valve voltage wire wireless telegraphy Wireless World World and Engineer