Nikola Tesla Patents
A metallic strip d', secured to an insulated post d", bears against the side of the cylinder c, connecting it with one part of the circuit. The central rod c" is connected to the frame of the instrument and so to the other part of the circuit through the forked metal arm e, the ends of which are fastened with two nuts to the projecting ends of the rod, by which means the cyl ter c is supported. In order to interrupt the flow of battery current which is started through the action of the sensitive device A' special means are provided, which are as follows: The armature e' of the magnet a, when attracted by the latter, closes a circuit containing a battery b' and magnet f. armature lever f' of this magnet is fixed to a rock shaft f", to which is secured an anchor escapement g which controls the movemen of a spindle g' driven by a clock. train K. The The spindle g' has fixed to it a disk g" with four pins b", so that for each oscillation of the escapement g the spindle g' is turned through one quarter of a revolution. One of the spindles in the clock train, as h, is geared so as to make one half of a revolution for each quarter revolution of spindle s'. The end of the former spindle extends through the side of the frame and carries an eccentric cylinder h' which passes through a slot in a lever h" pivoted to the side of the frame. The forked arm e which supports the cylinder is pivoted to the end of eccentric h', and the eccentric and said arm are connected by a spiral spring i. (13) 237
