On the Carrier Current Telephone System

Abstract

This Paper has been presented on the First meeting of the Institute of Electrical Engineers of Japan held in November, 1925 and is described especially on the latest development of the carrier telephone system on telephone lines. The writer points out the merits and dimerits of the various carrier telephone systems of Western Electric Co. in America, Telefunken A. G. and Lorenz A. G in Germany. Moreover, this paper contains the elucidations about the necessary requirements on the conditions of the lines, in Which the carrier telephone system is to be applied, and also the test results on the Tokio-Osaka telephone line, in which the carrier telephone system will be recently provided with. At the end, the application of this system is discussed from the economical standpoints.