Nikola Tesla Patents
428 0 to pass, the receiver R is operated, but only for a moment, since by the rotation of the devices a, a'and d, which may be all driven from the same shaft, the original conditions are restored, assuming, of course, that the electromotive force set up by the disturbances at the terminals of the sensitive device a is only momentary, or of a duration not longer than the time of closure of the primary circuit; otherwise the receiver will be actuated a number of times, and so long as the influence of the disturbances upon the device a continues. In order to render the discharged energy of the condenser more effective in causing the operation of the receiver, the resistance of the primary circuit should be very small and the secondary coil s should have a number of turns many times greater than that of the primary coil p. It will be noted, that since the condenser under the above assumptions is always charged in the same direction, the strongest current impulse in the secondary coil, which is induced at the moment when the brush k comes in contact with segment f is also of unchanging direction, and for the attainment of the best results it is necessary to connect the secondary coil so that the electromotice force of this impulse will be added to that of the battery and will momentarily strengthen the same. However, under certain conditions which are well understood by those skilled in the art, the devices will operate whichever way the secondary be connected. It is preferable to make the inductive resistances L and L' relatively large, as they are in a shunt to the device a and might, if made too small, impair its sensitiveness. On the other hand, the resistance L" should not be too large, and should be related to the capacity of the condenser and the number of makes and breaks effected by the device d in well known ways. Similer considerations apply, of course, to the circuits including the primary p and secondary s respectively. 18
