Even on a clear day the maximum periscopic range of a submarine's vision is only five nautical miles. Obvious solution is to equip the diver with detachable eyes —the airplane. Germany was first to recognize these facts and had at least one U-boat carrying an airplane at the end of the War. Great Britain now has many. The U. S. Navy tackled the problem in 1921, when a group of engineers headed by Professor Alexander Klemin, aerodynamics authority of New York University, built an experimental twin-float...
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