Title :
A focusing flashlight
Abstract :
A new focusing type of flashlight capable of throwing a beam of 200 to 300 feet greatly enlarges the scope of usefulness of this popular type of portable lighting unit.
Keywords :
Batteries; Bridges; Focusing; Lighting; Rivers; Safety; Vehicles;
Journal_Title :
American Institute of Electrical Engineers, Journal of the
DOI :
10.1109/JoAIEE.1923.6591859
