Page:Electricity (1912) Kapp.djvu/206

202 and a series winding, we can so proportion these coils that the terminal voltage shall remain sensibly the same over a large range of external load. Machines of this kind are called "compound machines."

Any dynamo may be used as an electric motor. The type most generally used is the shunt machine, since its speed, even under large variations of mechanical load, remains fairly constant.