Early Radio Wave Detectors |
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Page 59
... particles were found to make poor coherers , yet on the other hand very heavy oxidation also made for insensitivity and sluggish action . It was this fact that led Marconi and others to evacuate their coherers of air in order to prevent ...
... particles were found to make poor coherers , yet on the other hand very heavy oxidation also made for insensitivity and sluggish action . It was this fact that led Marconi and others to evacuate their coherers of air in order to prevent ...
Page 66
... particles and disrupting the chains so that the resistance increased markedly . A telephone receiver in the circuit of the local battery rendered this cessation of current audible , and such an arrangement was said to have been used in ...
... particles and disrupting the chains so that the resistance increased markedly . A telephone receiver in the circuit of the local battery rendered this cessation of current audible , and such an arrangement was said to have been used in ...
Page 75
... particles and as a polarisation cell.50 He pub- lished the interesting idealised curve of Fig . 4.8 . This is a plot of current through the cell ( vertical axis ) against time ( horizontal axis ) , and shows the response of the cell to ...
... particles and as a polarisation cell.50 He pub- lished the interesting idealised curve of Fig . 4.8 . This is a plot of current through the cell ( vertical axis ) against time ( horizontal axis ) , and shows the response of the cell to ...
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Common terms and phrases
acid adjustment aerial and earth aerial current alternating current apparatus arrangement audible battery BRANLY British Patent 18 capillary carrier caused circuit connected crystal current flowing decoherence deflection device diaphragm diode direct current disc dots ECCLES Edouard Branly effect Electrical World Electrician electrodes electrolytic detectors Fessenden filings coherer film Fleming flux frequency galvanometer glass tube Hertzian heterodyne History of radio hysteresis detector illustrated in Fig iron loop magnetic field magnetisation Marconi mercury metal mounted movement needles operation oscillations oscillatory current oxide particles plate platinum Proc produced 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 tone-wheel transmitter types of detector valve voltage wire wireless telegraphy Wireless World World and Engineer