108

INVENTIONS OF NIKOLA TESLA.

in poles A by tlie primary impulse. This condition is indicatedhy the characters n' s'.

In the circuit formed by the two sets of coils f and a is intro-duced a condenser h ; otherwise this circuit, is closed uponitself, while the free ends of the circuit of coils .k are connectedto a source of alternating currents. As the condenser capacitywhich is needed in any particular motor of this kind is depend-ent upon the rate of alternation or the potential, or both, its sizeor cost, as before explained, may be brought within economicallimits for use with the ordinary circuits if the potential of thesecondary circuit in the motor be sufficiently high. By givingto tlie condenser proper values, any desired difference of phasebetween the primary and secondary energizing circuits may teobtained.