Abstract
This paper describes a large tank facility that has been in operation since the first of the year at the Fullerton site of the Hughes Aircraft Company. This facility was designed primarily for making nearfield measurements of large underwater acoustic radiators. (The 30-ft-diam by 20-in.-high redwood tank is completely enclosed in a corrugated-metal building.) Unique features and capabilities of this installation are described. These include provisions for the reduction of both airborne and ground-transmitted acoustic noise; a truck entry from which large transducers can be lifted directly to the tank top level; a movable bridge for mounting transducer fixtures that may be positioned anywhere above the water surface or rolled clear of the tank for special test purposes; a complete complement of electronic instruments, including a Hughes-designed pulsing and gating unit, for making precise measurements of pressure amplitude and phase. Acknowledgment is made of the helpful and continuing encouragement and advice of Dr. Elias Klein of the Defense Research Laboratory, Austin, Texas.
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