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Underwater TV for Fishery Research R t ..CA's industrial television system, which has pro- vided a useful extension of human sight in many indus- trial, commercial and research operations, has now gone under water on a novel research assignment. Working beneath the coastal waters around Florida, the closed-circuit system is helping the U. S. Fish and Wildlife Service, Department of the Interior, to observe and test the performance of experimental fishery meth- ods and equipment under actual oceanic conditions. The work represents the first practical demonstration in this country of underwater television as a research tool for experimental fishery operations, and gives promise of a wide range of uses in marine biology and explorations. Details of the operation were recently disclosed jointly by Theodore A. Smith, Vice-President and Gen- eral Manager of RCA's Engineering Products Division, and Reidar F. Sand, Chief of the Fish and Wildlife Service's Gear Research and Development Program. Most recently, according to Mr. Sand, the Service has been employing closed-circuit television in connection with development of a midwater trawling net and in a remote study of shrimp in their natural habitat. "Operation F/sbeye" The underwater TV experiments were initiated with "Operation Fisheye," conducted recently in the Gulf Stream off the east Florida coast, it was disclosed by Mr. Smith. A standard RCA ITV closed-circuit televi- sion system provided remote observations of experi- mental fishery gear towed at depths of more than 60 feet. The gear was illuminated only by natural sun- light, and the views produced on a TV monitor aboard Reidar F. Sand, of U. S. Fish and Wildlife Service, readies diving bell which houses RCA TV camera used to observe fishery gear under water. the U. S. research vessel Pompano were sufficiently clear and sharp for photographing by both still and motion picture cameras. "Research in the field of fishery methods and equip- ment has been hampered by the limited access to direct observations of fishing gear in operation," Mr. Sand ex- plained. "Advances in the design and construction of nets, trawls and other devices have resulted latgely from trial and error, scanty information obtained from work with models, or information supplied by divers working with underwater film cameras. "The advent of underwater TV research in orher fields, indicating the possibilities of closed-circuit TV as a means for securing direct observation of fishing gear and methods, led to the assignment of such a project to the Service's Exploratory and Gear Development Station at Coral Gables, Florida." Inquisitive fish are televised as they inspect experimental shrimp trap on ocean bottom. Photo was taken from screen of monitor. 24 RADIO AGE