. Practical wireless telegraphy; a complete text book for students of radio communication . ing of two 5,000 volt generators connected inseries. The disc dischargers, D-1, D-2, etc., are set on the shaft sothat the condensers discharge and recharge at regular intervals insuccession, and if the velocity of the discs is adjusted so that theinterval between the beginning of the discharge of one condenserand the beginning of the discharge of the next condenser is equalto the period of the oscillations in the antenna circuit, or an exactmultiple thereof, the oscillations flowing in the antenna circ
. Practical wireless telegraphy; a complete text book for students of radio communication . ing of two 5,000 volt generators connected inseries. The disc dischargers, D-1, D-2, etc., are set on the shaft sothat the condensers discharge and recharge at regular intervals insuccession, and if the velocity of the discs is adjusted so that theinterval between the beginning of the discharge of one condenserand the beginning of the discharge of the next condenser is equalto the period of the oscillations in the antenna circuit, or an exactmultiple thereof, the oscillations flowing in the antenna circuit willoverlap, producing continuous oscillations of practically constantamplitude, as shown in Fig. 286. To insure that each condenser discharges at the right momentand that the successive groups of oscillations induced in the antennacircuit are in phase, the discharge circuit is provided vriih an auxiliary timing rotary discdischarger, known as the trigger or timing disc (not shown in the drawing), which performsthe function of setting off the main spark discharge at the proper Fig. 286—Showing HowGroups of Damped Oscil-lations Can Be Made toOverlap One Another. TRANSMITTERS OF UNDAMPED OSCILLATIONS. 275 A modified form of the timed-spark oscillation generator is shown in U. S. Patent 1,136,477of 1915, one arrangement being that shown in Fig. 287. Here a direct current generator isindicated at G and a choking coil at L-1. Since G has an electromotive force of about 10,000volts, condensers K-1 and K-2 receive a charge which enables them to discharge across thespark gap. A terminal of either condenser is connected to the disc dischargers, D-1 and D-2,and the studs of the latter are placed so that condensers C-1, C-2 and C-3 are alternatelyand successively charged, let us say, through inductance L-2 and successively dischargedand recharged through L-3. The oscillations set up in L-2 or L-3 are made to act inductively on an intermediatecircuit, L-4, L-S and C-4, and if
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