28 



Just before the beginning of this patrol nine bergs were reported 

 to the Chelan in latitude 40°05' N., longitude 47°42' W. A thor- 

 ough search was conducted in the vicinity and beyond the limits of 

 drift from the reported position but no ice was sighted. This fact, 

 coupled wdth the statement by the master of the reporting vessel that 

 the ice was sighted at twilight, indicates that probably cumulus clouds 

 beyond and in line with the horizon w^ere mistaken for bergs. The 

 Ice Patrol vessel experienced a similar situation on the evening of 

 June 2. At that time cumulus clouds on line with the horizon pre- 

 sented the appearance of numerous bergs. It was known, however, 

 that this was an illusion since the Champlain had just completed 

 scoutiug the area in which the bergs appeared to be and it was defi- 

 nitely knoM^n that no ice was there. 



The following is a summary of ice and water temperature reports 

 received during this cruise: 



Number of bergs reported south of latitude 48° north 140 



Number of bergs reported south of latitude 43° north 33 



Number of ice reports received 182 



Number of vessels furnishing ice reports 103 



Number of water temperature reports received 1 207 



Number of vessels furnishing water temperature reports 183 



Number of vessels furnished special information 14 



Number of trans- Atlantic planes furnished radio bearings 1 



SEVENTH CRUISE, "CHELAN," JUNE 6-23, 1939 



The C/tf^aw sailed from Boston, Mass., at 1607 on June 3, 1939, to 

 relieve the Champlain on Ice Patrol. The run to the relieving point 

 was uneventful and the Champlain was met in latitude 41°03' N., 

 longitude 50°30' W. The ice observation party reported on board 

 and at 1600 on June 6, 1939, the Chelan relieved the Champlain as 

 Ice Patrol vessel. 



Fog existed over the cold water during the first 12 days of this 

 patrol, so the Chelan searched along the southern and western edge 

 of the fog-covered area. Only one berg was sighted and that on the 

 11th in latitude 42°47' N., longitude 51°00' W. The patrol vessel 

 drifted with this berg until noon the next day, when it was left in 

 latitude 43°04' N., longitude 51°04' W. and the search of the south- 

 ern and western limits of the cold water was continued. Following 

 the southerly gales of June 7 and 8, surface temperatures indicated a 

 rapid recession of the cold water northward. The depth of this warm 

 water, however, will not be definitely known until completion of the 

 next current map by the General Greene. On June 16 the southern 

 limits of the cold water Averc defined as follows: Latitude 42°00' N., 

 longitude 51°29' W., thence latitude 41°35' N., longitude 51°40' W., 

 thence latitude 41°50' N., longitude 49°30' W., thence latitude 41°10' 

 N., longitude 48°40' W., thence latitude 41°10' N., longitude 48°00' 



