13 



much larger than a growler in size and that it was floating in warm 

 water, temperature 55°, it was not regarded as a potential menace. 

 We searched this vicinity on the 22d, however, the first opportunity 

 of clear weather but nothing was found so the Modoc was headed 

 westward for a rendezvous with the relief ship. 



There were 144 reports of ice received from passing vessels; 3 

 steamers were furnished special ice information upon request; and 

 a total of 1,002 reports of surface water temperatures were received. 



THE SEVENTH CRUISE, "TAMPA," JUNE 25 TO 30, 1926 



After taking over the patrol work from the Modoc it was decided 

 best to utilize the time compiling an ocean current map of the region 

 around the Tail of the Bank, in order that a record might be made of 

 the current conditions just before the patrol was discontinued. Sta- 

 tions were occupied along lines normal to the trend of the slope and 

 spaced at intervals of 50 to 75 miles. 



This work continued and the 26th found the Tampa running north- 

 ward on a line just south of the Tail. The water temperature wall 

 was found to lie in latitude 41° 55', longitude 50° 15', the thermometer 

 dropping from 61° to 57° quite abruptly. The position of the 

 temperature wall at this place refutes the belief that the position of 

 the Atlantic water had been changed much from that found earlier 

 in the season. Such an error of judgment is easily made because of 

 the relatively high temperature of the surface water which is attained 

 solely as an effect of the sun's heat with the approach of summer. 



The 27th, 28th, and 29th were spent on oceanographic survey and 

 when the weather was clear advantage was taken to include a search 

 for ice. Not a sign of bergs was found and so a recommendation was 

 forwarded to headquarters that the patrol be discontinued at mid- 

 night on June 30. A reply the next day directed the patrol to discon- 

 tinue its activities at midnight June 30 and return to the United 

 States. 



We headed westward on the last day of the month preparatory to 

 returning to Boston. No ice had been reported or sighted by the 

 patrol vessel south of the forty-fourth parallel since June 17 and this 

 area had been repeatedly searched since that date. We were quite 

 confident that no ice could possibly be in these waters. Bergs 

 continued to be reported on the northern part of the Bank and near 

 Cape Race as is usually the case at this time of the year. Messages 

 were dispatched to the wireless officer, Halifax; the officer in charge 

 radiocompass station, Cape Race; and the commercial wireless sta- 

 tion. Cape Race, notifying them all of the discontinuation of the ice 

 patrol and thanking them for cooperation during the 1926 season. 



During the cruise thus terminated the Tampa received 36 reports 

 of ice, furnished special ice information upon request to 1 steamship, 

 and received a total of 186 sea-water temperature reports. 



