Fifty different times, Westinghouse engineers have hurled the equivalent of a natural lightning stroke into this protected distribution transformer and each time it has withstood the blow of 50,000 amperes at a rise of between three and four million volts pressure.
The transformer is protected with de-ion gaps which bypass the lightning stroke into the ground and quench the attempt of the normal line voltage to follow the lightning out of the line and cause an interruption in service.
248723 No. 5
Original Caption by Science Service