Mine Development: In the mine development program the basic 

 problem is to obtain environmental measurements to enable the 

 development of better influence mines and determine mine 

 utilization and behavior in varied environmental conditions. 



Aircraft Carrier Motion: In the development of automatic carrier- 

 landing systems a knowledge of the surface waves in different 

 ocean areas is required. The same information is needed for sea- 

 plane hull design and performance prediction. 



Interaction of Sea and Atmosphere : The Bureau provides meteoro- 

 logical services to the Navy. It is, therefore, very much interested 

 in the interaction of the sea and atmosphere and instrumentation 

 to study this interaction. 



These brief descriptions hardly do justice to the significant 

 oceanographic projects underway at such field activities of the 

 Bureau of Naval Weapons as the Naval Ordnance Test Station, 

 China Lake, the Naval Ordnance Test Station, Pasadena, the 

 Naval Ordnance Laboratory, White Oak, the Naval Underwater 

 Ordnance Station, Newport, and the Naval Air Development 

 Center, Johnsville. In addition, the Applied Physics Laboratory, 

 University of Washington, and the Ordnance Research Laboratory, 

 Pennsylvania State University, conduct for the Bureau considerable 

 oceanographic research and instrumentation development, partic- 

 ularly in the area of underwater acoustics. The Applied Physics 

 Laboratory has played a dominant role in the development of 

 underwater range acoustic tracking equipment, of which we will 

 have more to say. 



The oceanographic work conducted in connection with the 

 programs previously mentioned calls for a wide variety of oceanog- 

 raphic and marine geophysical instrumentation. Permit me to des- 

 cribe briefly a few typical exannples of instruments that have been 

 developed at BUWEPS activities. 



Naval Ordnance Test Station, China Lake, has developed the 

 \inderwater SVTP, a self-contained unit with which sound velocity, 

 temperature, and pressure are nneasured simultaneously. The 

 present accuracy of the measuremients is: sound velocity, about 

 0. Z5 meters per second; temperature, one hundredth of a degree 

 centigrade; and pressure, 1 percent of full range. The signals from 

 the sensors are telemetered along a single-conductor polyethylene 

 covered steel cable in the form of different frequencies. The 



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