Undulatory Discharge

—An oscillatory discharge, a series of rapid alternations of charges which are set up when the plates of a charged condenser are joined by a conductor, the plates of the condenser being positively and negatively charged in turn. A high frequency alternating current flows in the conducecr, but it soon dies away as the encrgy of the condenser pa es Into heat. Undulatory Winding.~-A method of armature winding, usually known as wave winding. Each step of this winding is progre ive, and two succe ive winding elements have the appearance of two succe ive waves. Wave winding has only a single pitch, and all steps are made equal in order to render the winding symmetrical.