Science: Underwater Radar

All Seattle Engineer Wayne M. Ross planned to do was build a simplified sonar* device for finding sunken outboard motors, lost fishing gear and other salvage. When he thought he had solved the problem, he mounted his invention on a fishing boat and tested it off the coast of Alaska. It worked so well that he could not only spot schools of fish, he could usually tell what kind they were (by the size of the school and the depth at which it swam). Even more important, in narrow, rock-lined Alaskan channels his underwater signals bounced back from shoals and shore...

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