This task has just been accomplished., and the purpose of this report 

 is to tell how the operation was planned, how the data were obtained, and how 

 the coinputations were made. Finally, the results obtained will be analyzed 

 and interpreted. The original data, the reduced data, and the results of all 

 computations are included in both pictorial and tabular form. 



As this report is studied by its readers, it will become apparent that it 

 would never have been written were it not for the combined efforts of a very 

 large number of people with diverse talents and abilities. They represent a 

 wide variety of U. S. Navy organizations and civilian research organizations. 

 As many as possible have been mentioned and thanked in this report, but some 

 who have helped immensely in this work remain anonymous because it is not 

 possible to list them all. Our thanks are extended to a.-ll individuals who 

 helped in this work and to all cooperating groups, and the hope is expressed 

 that the final analysis of the results will prove of sufficient value to justify 

 the tremendous effort expended on this task. 



