On a New A. C. Potentiometer

Abstract

The principle and the result of the laboratory experiment with regards to the new alternate current potentiometer are shortly explained. This instrument has one superior advantageous feature than Gall's potentiometer; that is the phase difference beween the potentials of its component potentiometers is always rigorously at right angle for all commercial frequencies(20‾200‾).
No adjustment is necessary to set the phase angle accurately in quadrature, if it is used for any frequency within the range above described.
Before measurement, adjustment of the current magnitudes is only necessary. It seems to the authors that this instrument can be operated more quickly than any other a.c. potentiometer, as far as they are aware of, without losing the sufficient accuracy and precision.
The actual construction of the instrument is also very shortly described in the part at the end of this paper.