FOREWORD 



Effective thermal structure analyses and predictions for the 

 Antisubmarine VJarfare Environmental Prediction System (ASWEPS) of 

 the U.S. Naval Oceanographic Office require accurate data from many 

 sources. An important source of subsurface temperature data for such 

 analyses and predictions is the mechanical bathythermograph. This 

 instrument, originally designed for operational use, was known to be 

 of only approximate accuracy. The quantitative magnitude of instru- 

 mental errors was not known when the ASWEPS program was instituted. 

 The Naval Oceanographic Office, in connection with its field research 

 surveys, has conducted a number of field experiments to determine the 

 magnitude of certain bathythermograph errors. The resitLts of these 

 experiments are presented in this report. 



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0. D. WATERS, JR. 



Rear Admiral, U.S. Navy 



Commander 



U.S. Naval Oceanographic Office 



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