"When the bell rings, open your mouth, stop up your ears, shut your eyes and you'd better stand up because sparks are not so apt to land in your lap," said the mild-mannered, middle-aged man who was running the show. "Better wear a hat, too, if you have one."
The bell rang. Between two spheres the size of grapefruit leaped an electric flash. The gap was only six inches, but the flash was blinding, the report thunderous. The voltage was not extraordinary (150,000), but the...
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