Electrical transmission of electrical measurements
O. J. Bliss · Proceedings of the American Institute of Electrical Engineers · 1912
The unique arrangement of standard instruments described in this paper was made for the purpose of transmitting and reproducing at a distance a direct electrical measurement, the distance in point being 35 miles (56 km.), the measurement the indicated kilowatts input to a 12,000-volt, 60-cycle, three-phase transmission line, and the medium of transmission a telephone line owned by the local telephone company but used as a private line by the central station companies.