Although rain was beating down on Cambridge, Md., last week, men enthusiastically lugged into the Choptank River a one-ton steel model of the steel islands (seadromes) which Edward R. Armstrong of Holly Oak, Del., proposes to anchor 375 miles apart across the Atlantic. The model, 1/32 the size of intended seadromes, consists essentially of a rectangular platform. To its underside are attached hollow steel columns, each ending in a circular disk. Air in the cylinders was sufficient to keep the device floating on the Choptank and the platform several feet above the...

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