Nikola Tesla - Free-Energy Devices

66 INVENTIONS OF NIKOLA TESLA.has the advantage that the closed armature-circuit imparts to themotor torque when the speed falls off, but at the same time theconditions are such that the motor comes out of synchronismmore readily.To increase the tendency to synchronism, twocircuits may be used on the armature, one of which is short-circuitedon the start and both connected with the external circuitafter the synchronous speed is reached or passed. This dispositionis shown in Fig. 53. There are three contact-rings a b eand three brushes c d f, which connect the armature circuitswith the external circuit. ( )n starting, the switch H is turned tocomplete the connection between one binding-post p and the fieldcoils.This short-circuits one of the armature-coils, as G. Theother coil F is out of circuit and open. When the motor isupto speed, the switch H is turned back, so that the connectionfrom binding-post p to the field coils isthrough the coil G, andswitch K is closed, thereby including coil F in multiple arc withthe field coils. Both armature coils arethus active.From the above-described instances it is evident that manyother dispositions for carrying out the invention are possible.