A STREET LIGHT
CD 1964097 E&MP27.074
A street light which turns itself on and off is one of the latest contributions to the illumination art. It is of the sodium vapor type, and has a photoelectric cell, or electric eye, built in to the rear of the unit. As soon as the outside brightness drops to a specified level, the lamp is turned on, to be extinguished later when dawn comes. A time delay mechanism prevents a flash of lightning, or an automobile headlight, from turning it off.