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Sumpner Reflecting Electro-Dynamometer. (Fig. 28.)

An instrument of a moving coil type, designed for use with alternating currents.

The laminated electro-magnet lias two fine wire coils, A, B, of 2,000 turns wound upon it, each, of whicli will take 100 volts, and a third coil, C, of 200 turns, for use with lower voltages. The flux, produced by these coils in the space occupied by the moving coil is proportional to the voltage applied and in quadrature with it.

The moving coil is fed from the same source or off one of the other coils through a condenser, thus producing a quadrature current flux, at 180° phase displacement from the magnet flux, so that the deflection is proportional to the square of the voltage multiplied by the capacity of the condenser. If the low

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