Nikola Tesla Patents
T lights. Both of the lights may be colored, and by flashing them up whenever desired, the operator may guide the vess el in its course. For such purposes also the standards rr are provided, which should be painted in lively colors so as to be visible at great distance. By opening and closing the circuits eirauits of motor F a greater number of times, preferably determined beforehand, the lever m" is brought in contact with post n', thus closing the circuit of the main battery through a device o and bringing the latter into action at the moment desired. By similar contrivances, or such as will readily suggest themselves to mechanicians, any number of different devices may be operated. Reference is now called to fig. 9, which illustrates diagrammatically the system as practised when directing the movements of a boat. In this fig., S designates any kind of source of electrical disturbance or oscillations, the generation of which is controlled by a suitable switch contained in box. T. The handle of the switch is movable in one direction and provision is made only and stops on four points t tuu', so that, as the handle passes from stop to stop, oscillations are produced by the source during a very short time interval. There are thus produced four disturbances during one revolution, and the receiving circuit is affected four times, but it will be understood from the foregoing description of the controlling devices on the vessel, that the rudder will be moved twice, once to right and once to left. Now I preferably place the handle of the switch so that when it is (21) 245
