High Frequency Apparatus Page 72

22 72 HIGH FREQUENCY APPARATUS Fig.1 Circuit for D.C. K' Close switch for A.C. ell Fig.2 Circuit for A.C. or D.C. Figs. 1 and 2.-Wiring diagrams for the kicking coil apparatus condenser which discharges its load through the inductance and across the interrupter contacts as soon as the latter close up sufficiently for the charge to leap this small air gap. By making suitable adjustments of condenser and the ratio between the turns in primary and secondary of the oscillation transformer, a high frequency current of practically any desired frequency and voltage may be obtained, within the limits of the outfit's capacity. The greatest merit of this apparatus is its ability to operate on either alternating or direct current circuits with merely a slight change in the number of turns in the winding. While it is an undisputed fact that the "kicker" cannot compare with a transformer outfit on alternating current circuits, still it serves admirably in cases where direct current only is available. The ideal outfit is, of course, one that will operate with workable satisfaction on both direct and alternating current circuits; the latter to comprise various frequencies found in common use. The design offered herewith incorporates all of these desirable characteristics through the introduction of a variable condenser and an extra kicking coil. The latter is short circuited when the outfit is used