. Practical wireless telegraphy; a complete text book for students of radio communication . f the Oil Plate Condenser. of the condenser of the closed circuit, a back pressure is exerted on the secondary windingof the high voltage transformer. Although the impedance of the spark gap circuit is so lowcompared to that of the secondary winding of the transformer that the spark leaps the gapin preference, the discharge of the condenser may cause sufficient difference of potential between the turns of thesecondary units of thetransformer to puncture theinsulation and short circuitadjacent layers. Po
. Practical wireless telegraphy; a complete text book for students of radio communication . f the Oil Plate Condenser. of the condenser of the closed circuit, a back pressure is exerted on the secondary windingof the high voltage transformer. Although the impedance of the spark gap circuit is so lowcompared to that of the secondary winding of the transformer that the spark leaps the gapin preference, the discharge of the condenser may cause sufficient difference of potential between the turns of thesecondary units of thetransformer to puncture theinsulation and short circuitadjacent layers. Possiblepunctures from this sourcemay be obviated by meansof choking coils of rela-tively high self inductanceconnected between thetransformer and the con-denser as shown at N andN2, Fig. 130. These coilsconsist of a few turns of finewire wound in the form ofa spiral, or in a single layeron a porcelain, glass or hardrubber tube. They offer butlittle impedance to the lowfrequency current flowingfrom the secondary windingFig. 129a—Marconi Glass Plate Condenser of the transformer, but they. 112 PRACTICAL WIRELESS TELEGRAPHY. greatly impede the radio-frequency oscillations. Hence the secondary winding is protectedfrom injury. 108. High Voltage Transformers.—The construction of the open andclosed core types of transformers of the Marconi Company is shown in Figs. 131and 132. The primary coil of the open core transformer is wound on a core consisting o£a bundle of fine iron wires bound in circular form. The core is covered with
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
