. The thermionic vacuum tube and its applications . ^ of interruption of theprimary current should not he very high. 51. The Thermionic Valve as a Voltage Regulator. Therapid increase in the saturation thermionic current with increasein the filament temperature, or filament heating current, as isshown by Richardsons equation, can be utihzed to control thevoltage of the generator of varying speed. A scheme wherebythis can be done, and which was devised bj^ H. M. Stoller, is shownin Fig. 65. Here the tube is used to regulate the voltage suppliedby a wind-driven generator such as has been used on
. The thermionic vacuum tube and its applications . ^ of interruption of theprimary current should not he very high. 51. The Thermionic Valve as a Voltage Regulator. Therapid increase in the saturation thermionic current with increasein the filament temperature, or filament heating current, as isshown by Richardsons equation, can be utihzed to control thevoltage of the generator of varying speed. A scheme wherebythis can be done, and which was devised bj^ H. M. Stoller, is shownin Fig. 65. Here the tube is used to regulate the voltage suppliedby a wind-driven generator such as has been used on generator is designed to supply a high voltage for the platecircuit of thermionic tubes and a low voltage for heatmg the RECTIFICATION OF CURRENTS BY THERMIONIC VALVE 143 filaments. D and M are the differential and main field windingsof the generator. The thermionic valve is inserted as indicated ^ Moltagtf ?® Common. Fig. 65
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