. Practical wireless telegraphy; a complete text book for students of radio communication . is the usual con-denser of the closedoscillation circuitand L the variableinductance. In theusual maimer, theoscillations generat-ed in this circuit aretransferred to theantenna circuit bymeans of an oscilla-tion The functioning ofthis apparatus is asfollows : When theelectrodes of the arc A, B, are first placed in contact and then given the correct separation,considerable difference of potential exists across the terminals as can be shown by a volt-meter. Accordingly a certain amount of c
. Practical wireless telegraphy; a complete text book for students of radio communication . is the usual con-denser of the closedoscillation circuitand L the variableinductance. In theusual maimer, theoscillations generat-ed in this circuit aretransferred to theantenna circuit bymeans of an oscilla-tion The functioning ofthis apparatus is asfollows : When theelectrodes of the arc A, B, are first placed in contact and then given the correct separation,considerable difference of potential exists across the terminals as can be shown by a volt-meter. Accordingly a certain amount of current flows into the condenser C which receivesa charge. The charge taken by the condensers robs the arc of some of its current, which Fig. 278—Fundamental Diagram of the Poulsen Arc Fig. 279—Complete Circuits of a Modern Arc Transmitter. further increases the potential across the arc and places a still greater charge on the con-denser. When fully charged, the condenser discharges across the arc gap and lowers thearc voltage. This decrease of arc voltage also assists, the discharge of the condenser mate- 266 PRACTICAL WIRELESS TELEGRAPHY. rially and due to the inertia of the oscillation circuit, the condenser will continue to dischargein the opposite direction, or, in other words, an alternating current will flow through theoscillation circuit. Due to the fact that direct current is constantly supplied to the arc andcondenser, this process of charge and discharge continues so long as the arc is in operation,and the resultant frequency of oscillation is approximately that due to the inductance,capacity, and resistance of the condenser circuit. The oscillations flowing in this circuitare transferred to the aerial wires from which part of their energy is radiated i
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
