On the Two Phase Source for the Co-ordinate Potentiometer

Abstract

The use of Tinsley-Gall Co-ordinate Potentiometer is prevailing for accurate a. c. measurment. The author deviced a new method of producing quadrature current for the above potentiometer as described in the text. This method is specially convenient for frequencies less than 150 cycles per second and the adjustment of phase and magnitude of the quadrature current for the variation of working frequency is effected by setting two rheostats independently. Other methods recommended by Messrs Tinsley & Co. or used by other auther are also described.