are in part conically shaped on the sides that are opposite one another in order to preserve a certain linearization in the stroke and a more favorable course for the lines of force and thus also for the regulator output of the magnet the armature 22 is furthermore loaded by a spring 25 that works counter to the force of the regulator spring 21 since the force of the magnet increases with decreasing distance between armature and core while in contrast the force of the spring 25 decreases with the increasing stroke here also a certain linearization of the force of the magnet engaging the regulator lever 15 is attained the stroke of the armature 22 and with that the path of the regulator lever 15 is measured by a transducer 26 in that a ferromagnetic core 27 on which an induction coil 28 is positioned projects into a short circuit ring 29 which is fastened on the regulator lever 15 as can be seen from fig2 in which the area around the transducer 26 is depicted from another point of view the core 27 is in the form of a u and the regulator lever 15 is pierced for the purpose of receiving this core 27 the second embodiment of the invention is shown in fig3 in which the magnet in comparison to the first embodiment of fig1.