The induction watt-hour meter

The paper discusses the principles and theory of operation of the induction watt-hour meter. The problem of the meter broadly stated is to construct an electric motor the speed of the rotating member of which shall be directly proportional to the electric energy supplied to its windings, such proportionality to be maintained for all conditions of operation. The method of compensation is discussed and also the effect of change in frequency and wave shape. The rotating field principle on which some foreign instruments are based is treated mathematically and the construction of the shifting field meter is also described.