Nikola Tesla Patents
J To tion of the relay, to precisely the same electrical condition, and offer the same resistance to the flow of the battery current until another impulse from afar reaches. the receiving circuit. O The relay magnet a should be of such character as to respond to a very weak current and yet be positive in its action. To insure the retraction of its armature e' after the current has been establ hed through the magnet i and interrupted by the inversion of the sensitive device c, a light rod k is supported in guides on the frame in position. to be lifted by an extension k' of the armature lever I and to raise slightly the armature e. As a feeble current may normally flow through the sensitive device and the relay magnet a, which would be sufficient to hold, though not drawn the armature down, it is well to observe this precaution. The operation of the relay magnet a and the consequent operation of the electro-magnet ,as above described, are utilized to control the operation of the propelling engine and the steering apparatus in the following manner: On the spindle g which carries the escapement disk g", Fig. 4 and Fig. 6, is a cylinder i of insulating material with a conducting plate or head at each end. From these two heads, respectively, contact plates or segments 1' 1", extend on diametrically opposite sides of the cylinder. The plate i" is in electrical connection with the frame of the instrument through the head from which it extends, while insulated strips or brushes J J' hear upon the free end or head of the cylinder and the periphery of the same respectively. Three terminals are thus provided, one -16269
