A direct-current generator for constant potential at variable speed

The standing of this problem in the past is briefly reviewed. As far as is known to the author the type of machine described presents a new solution, the advantages of which are shown to be: 1. The machine is self-excited, i. e., regulates independent of any other source of potential. 2. The machine regulates independent of speed and load and may be compounded. 3. The regulation is inherent, i.e., no external regulating device is used. 4. The regulation is instantaneous. 5. The regulation is approximately independent of the heating. The theory of the machine is described and diagrams of connections given. Performance curves obtained from tests are shown. A method is described whereby instantaneous regulation of the voltage is obtained, which method also secures approximately a constant voltage independent of the heating. Finally there follows a discussion of the efficiency of the new machine as compared with a standard machine of the same speed and output.