Engineer Howard R. Armstrong is a man of vision, but hardly a visionary. He has flown in airplanes for over 20 years. He has ascended professionally to the head of the mechanical experimental division of the vast E. I. du Pont de Nemours Co. of Wilmington Del. When he talked last week of a plan that has been in his head for 20 years, he got a respectful hearing from Army and Navy officials, the press and his fellow scientists.

He called them "seadromes"— enormous floating islands of steel and concrete, to...

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