Some experiences with a 202-mile carrier-current telephone

ON April 11th, 1923, the Pacific Gas and Electric Company placed in operation a carrier-current telephone system between Pit River Power House No. 1 and Vaca-Dixon substation. This system utilizes the twin-circuit 220,000-volt transmission lines between the two points for a conducting medium and is for use primarily by the operating department in directing the operation of the power houses in the Pit River development together with the transmission lines which carry the energy southward to the distribution center at Vaca-Dixon substation. With the commencement of work on Pit River Power House No. 3 an increasing volume of messages is being received from the construction and auditing departments for transmission to the general offices of the company, and it is already apparent that additional carrier-current telephone sets will be required, one at the base of construction operations for Power House No. 3 and one at Claremont substation in Oakland to relieve the congestion on the wire line between Vaca-Dixon substation and the load dispatcher's office.