Future investigations will include considera- 

 tion of the characteristics of the reflecting 

 particles and a rigorous mathematical analysis 

 of the output signal. 



ACKNOWLEDGMENTS 



The authors wish to acknowledge the valuahle 

 assistance of Mr. Herbert Cook of Airpax Elec- 

 tronics, Inc. who furnished the magmeter fre- 

 quency meter, Mr. Hall Kaighin who designed and 

 fabricated the transducer fixture head and 

 Mr. Harvey Sachs who participated in the experi- 

 ments. Work on this project was made possible 

 by support of the Office of Naval Research, 

 Contract Nonr8 1 +0(0l) . 



REFERENCES 



1. HORTON. J. W., Fundamentals of sonar, 



U. S. Naval Institute, Annapolis, Maryland, 

 1-18, 1959- UNPUBLISHED. 



2. JENKINS, F A. and H. E. WHITE, Resolving 

 Power of a Circular Aperture, Optics , 

 McGraw-Hill Book Co., 2nd Edition, 1-316, 

 1950. 



3. CHAPULNIK, J. D. and P. S. GREEN, A Doppler- 

 shift ocean-current meter, Marine Sciences 

 Instrumentation , 1, Instrument Soc . Amer . , 

 Plenum Press, New York, N. Y. I962. 



13^ 



