I . INTRODUCTION 



In November 1961, three oceanographic survey ships--USNS BOWDITCH 

 (T-AGS 21), USNS DUTTON (T-AGS 22), and USNS MICHELSON (T-AGS 23)-- 

 returned to New York from survey operations in the Norwegian Sea. 

 This voyage provided the Oceanographic Office an unusual opportunity 

 to collect magnetic and bathymetric data during multi-ship survey 

 operations. The three ships returned to the Norwegian Sea in March 

 1962, and again magnetic and bathymetric measurements were taken con- 

 currently. 



This report presents the magnetic data obtained on these North 

 Atlantic crossings. Bathymetric data are included for direct compari- 

 son between magnetic and topographic features. The data presentation 

 is in profile form and is divided into two parts. Part I presents the 

 data from the westbound crossing between the Norwegian Sea and New York; 

 Part II presents the data from the eastbound crossing. In Part I, the 

 profiles observed concurrently by each of the three ships during the 

 westbound crossing are presented together on the same pages. This 

 type of presentation was arranged so that any trends could be observed 

 readily. In Part II, profiles from the BOWDITCH and DUTTON also are 

 presented on the same pages. The MICHELSON data, however, are presented 

 separately because the MICHELSON route on the return crossing differed 

 considerably from the routes of the other two ships. 



The amount of data contained in this report is so extensive that 

 a complete analysis would make it unavailable for a long time. There- 

 fore, no analysis or interpretation is presented in this report. 



