PERFORMANCE OF UNDERWATER HORNS,
MASSA DIV CHOU ELECTRONICS INC HIMGHAM MASS
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The report presents the results of tests showing the performance of several types of experimental underwater horns, especially in regard to their effectiveness in increasing the radiation resistance loading on a vibrating transducer whose dimensions are small compared to the wavelength of the radiated sound. An NRL 2 kc transducer having a 5 in x 5 in radiating face was used as the driver and all the horns are of the same dimensions and shape except for the variations in their wall construction. Three steel horns were built in accordance with the requirements of the contract. In addition, a concrete horn structure was built outside the scope of the contract which incorporates proprietary ideas of a horn construction previously proposed for underwater applications. An experimental concrete structure also was built.