Victor Henry’s first glimpse of British radar scopes at Ventnor, in a small stuffy room lit by one red light and foul with smoke, was a deep shock. He listened intently to the talk of the pale, slender man in gray tweed called Dr. Cantwell, a civilian scientist, as they inspected the scopes. But the sharp green pips were news enough. The British were miles ahead of the United States. They had mastered techniques that American experts had told him were twenty years off. The RAF could measure the range and bearing of a ship down to a hundred yards or less, and read the result off a scope at
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