Abstract :
A. H. Kehoe: There are a number of systems using the multiple type of street lamp, but the advantages of controlling them by relay has not been generally realized. The subject was intensively studied by the companies supplying Manhattan Island in 1918. Early in 1920 the United Electric Light and Power Company had completely equipped all of its street lamps for relay control of a type as indicated in the paper. This system uses an a-c. relay at every lamp except in the case of park lighting, where an installation´s only purpose is for street lighting. With this system, the reliability in operation is very good as a relay failure affects but one lamp.
