Make-and-break sparking devices in which the movable electrode is carried by a rock-shaft and the electrodes separated by a reverse movement of the movable electrode, the relatively fixed electrode being rigid and unyielding the operating means to the movable electrode including a hammer element adapted to separate the electrodes by delivering a blow to the movable electrode, whereby a more sudden
separation of the electrodes is secured and a more effective spark produced.
(1) Note. For other sparking devices in which the means for separating the electrodes include an element designed to deliver a blow to the movable electrode, but which do not have the structural features enumerated in this definition, see the preceding subclass.
