objects vrherever possible. Two bearings were considered 

 sufficient for plankton stations, othervn.se three cross- 

 bearings were taken when possible snd these stations pieced 

 in the center of the resulting triangle. When a distance 

 frora land was too great to obtain clear be£ rings, dead 

 reckoning was kept from the Ic st kno^.m position until re- 

 turning at the end of the day's work becrinf?:s wore again 

 obtained. As steady wind and sea condisions are the rule 

 during sunmer in this arf:a it was possible to avoid working 

 the outer stations during unsettled weather. The difference 

 between the final dead rec'coning position an-:' that found 

 by bearings was pro-rated along the ship's course for the 

 day. These differences v/ere not used to estimate current 

 as they were obviously largely caused by leeway. In order 

 to prevent error in these calculations frcii the' effect of 

 the many movable masses of iron and. "steel in our equipment 

 upon the magnetic compass, the latter was frecjuently 

 checked against the sun's azimuth. 



The charts for the final plottings were pr<;pared 

 from aerial photographs by the radial line method. 



* . 



- TEMP2Ri5TURE end Si^LINITY , : 



■ -• - .1 



Fig. 3 shows a teorperature profile constructed from 

 a series of stations extending across the Tongue of the 

 Ocean. As shoim in table 1, no temperature observations 



