CONTENTS 



THE PROBLEM OF DEPTH CONTROL. . .page 5 



THE NEL DEPTH REGULATION EQUIPMENT. . . 8 

 Description. . . 5" 

 Operational Factors. . . 1 1 



EVALUATION. ..12 



DISCUSSION AND CONCLUSIONS. . . 13 



ILLUSTRATIONS 



1 Ship motion. . .pa ge 5 



2 Oceanographic winch with depth regulation equipment. . . 9 



3 Schematic of depth regulation equipment. . . 9 



4 Depth sensor mechanical details. ..10 



5 Depth sensor location and development of error signal. . . 10 



6 General depth control relationships. . . 12 



REVERSE SIDE BLANK 



