Methods of Measuring the Insulation of Telephone Lines at High Frequencies

This paper outlines the problem of measuring the insulation of open-wire telephone circuits in the frequency range from 3000 to 50,000 cycles, and discusses a method which has been used in the experimental study of insulator losses at these frequencies. The paper includes a description of a special line which has been constructed for the testing of insulators, an explanation of the essentials of the measuring technique, and a brief summary of the results which have been obtained.