Abstract :
In the days of the horse-drawn vehicle a simple danger sign sometimes supplemented by a bell furnished adequate warning at dangerous crossings, such as railroad grade crossings, etc.
Keywords :
Batteries; Cities and towns; Lenses; Lighting; Maintenance engineering; Standards; Vehicles;
Journal_Title :
American Institute of Electrical Engineers, Journal of the
DOI :
10.1109/JoAIEE.1922.6591033
