Nikola Tesla Patents
276 rear of the circle. Under these conditions the rudder will be turned to starboard, and the circuit of motor D interrupted between brushes 5 and 6. At the same time, only one of the circuits of motor F,--that controlled by relay Kis capable of being closed, since brush 2, which connects with the other, is out of contact with the long segment 21. Assuming now that it is desired to start the vessel and direct it to a given point. The handle T is turned from its normal position on point u' to the point t on the switch box. This sends out an electrical disturbance which, passing through the receiving circuit on the vessel, affects the sensitive device A' and starts the flow of current through the local circuit, including said device, the relay a and the battery a'. This, as has been previously explained, turns the cylinder i and causes the brush J to pass from insulation onto the contact i'. The battery k" is thus closed through relay K", and the latter closes that circuit of the motor F which, startwhich ing from plate 22, is permanently connected with one pole of the main battery, is completed through the brush 1, the field of motor F, wire 19, the armature of relay K", wire 16, the motor m, the brushes and commutator of motor F, and wire 15 to the opposite terminal of the battery E. Motor F is thus set in operation to shift the rudder to port, but the movement of plate L', which follows, brings the brush 6 back onto segment 8 and closes the circuit of the propelling motor, which starts the vessel. The motor F is permitted to run until the rudder has been turned sufficiently to steer the vessel in the desir-23
