Dr. P.L. Bellaschi, director of the Westinghouse high voltage laboratory at Sharon, Pa., examines pictures of laboratory lightning to determine the voltage and duration of man-made strokes used to test transformers and other electrical apparatus.
Resembling business charts, the pictures or graphs are produced in a cathode ray oscillograph which records on film the intensity of laboratory lightning.
Studies like this have enabled Westinghouse engineers to build electrical equipment that withstands nature's most powerful thunderbolts.
Original Caption by Science Service