Planes are the submarine's deadly enemy. Now the submarine is to be provided with a periscope several thousand feet high, flying 90 miles an hour. Tests are being carried out by the Navy at Anacostia, D. C., on a tiny machine, the XS-I, equipped with a 60 horsepower air-cooled engine, weighing but 1,000 pounds, so small that it can be placed in an ordinary living room. Ingenious construction enables the plane to be knocked down rapidly and stowed away in the few cubic feet of space available in the restricted interior of...
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