Nikola Tesla Patents
240 action. To insure the retraction of its armature e after the current has been established through the magnet I and interrupted by the inversion of the sensitive device A, a light rod k is supported in guides on the frame in position to be lifted by an extension k' of the armature lever 1 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 draw the armature down, it is well to observe this precaution. The operation of the relay magnet a and the consequent operation of the electro-mag net as above described, are utilized to control the propelling engine and the operation of the steering apparatus in the following manner: 1 On the spindle g' which carries the escapement disk E", fig. 4 and fig. 6, is a cylinder i of insulating material with a conducting plate or head at each end. From there 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' bear upon the periphery of the cylinder and the free end or head of the same respectively. Three terminals are thus provided, one always in connection with plate j', the other always in connection with the plate j", and the third adapted en the strips and i" in succession or upon the intermedia te insulating spaces, according to the position in which the commutator is brought by the clock train and the anchor escapement - does not control. the propelling Engine? (16) rest
