. Practical wireless telegraphy; a complete text book for students of radio communication . rimary and secondary coils being placed in afixed mechanical position, but for the synchronous rotary spark gap they are drawn apart towhatever degree of separation is necessary to radicite a pure wave. In certain installationsthe primary and secondary windings may be placed in a fixed mechanical position for therotary discharger as well as for the quenched gap. (1) Explanation of the circuits. It will be observed from the diagram, Fig. 246, thatthese sets are fitted with a change-over switch which perm
. Practical wireless telegraphy; a complete text book for students of radio communication . rimary and secondary coils being placed in afixed mechanical position, but for the synchronous rotary spark gap they are drawn apart towhatever degree of separation is necessary to radicite a pure wave. In certain installationsthe primary and secondary windings may be placed in a fixed mechanical position for therotary discharger as well as for the quenched gap. (1) Explanation of the circuits. It will be observed from the diagram, Fig. 246, thatthese sets are fitted with a change-over switch which permits either the rotary disc dischargeror the quenched spark discharger to be cut in the circuit. The gaps are connected in seriesand to change from one to the other, it is only necessary to shift the position of the switchK. Wl^en the quenched discharger is in use, a compensating inductance L, Fig. 246, makesup for the length of leads connected from contacts 58 and 59 to the rotary disc discharger,thereby keeping the wave-length of the closed oscillatory circuit constant. When the rotary. Fig. 253—Detailed Sketch of Marconi Quenched Spark Gap. discharger is connected in the circuit, the flexible leads attached to the quenched gap platesmust be connected together. In the diagram, Fi^. 246, the high potential transformer of the set is represented by theprimary and secondary windings P and S respectively; the high potential condensers at C-1and C-2; the primary winding of the oscillation transformer at P-1, the secondary at S-1;also an aerial tuning inductance S-2 with flexible contacts A, B and C, and, in addition, acontinuously variable tuning inductance S-3. The antenna system further includes the seriescondenser C-3 and the aerial ammeter. The distinctive feature of this apparatus is theprimary wave-length changing switch W-1 operated simultaneously by a single handle inconjunction with the switch W-2. It will be observed that when W-1 is in contact withpoint 39, a single uni
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Keywords: ., bookcentury1900, bookdecade1910, booksubjecttelegra, bookyear1917
