Zero method of measuring power with the quadrant electrometer

This paper describes a zero method of measuring power by means of the quadrant electrometer developed by the authors, and which we believe to be new. Zero deflection of the electrometer is obtained by opposing the torque produced by the a-c. load by means of a counter torque set up by continuous potentials introduced into the electrometer circuit. The continuous potentials required are small in value and easily handled. We have derived the equations that apply to the method and checked their correctness by experimental observations on resistance, capacity, and inductive circuits.