Abstract :
Purposes Early in the 15th century street lights were ordered in Paris, France, to prevent crimes of violence. This was at a time when the only occupants of the streets after night were belated pedestrians and a few vehicles. In the present day the use of our streets by night is growing and ever increasing. In fact the traffic in certain sections is heavier, in some cities, during the earlier part of the evening than it is at any time during the day. It is necessary to provide street illumination to mark the course, assist the police, also to avoid obstacles and to recognize persons. Police require to observe suspicious characters, and to see numbers on automobiles.
