84 



value of such a report one must be guided by previous experiences; 

 distance of the reporting ship from the berg; radio transmission; 

 visibiHty at the time; water temperature at the berg; familiarity of 

 the particidar steamer vriih. the ice regions (that is, wiiether she is a 

 frequent passer or a stranger) ; accuracy of the position of the report- 

 ing steamer as determined by recent astronomical observations; 

 time of day. Near sunset clouds and fog often create fantastic 

 shapes, whicli, under certain atmospheric conditions, may mislead 



44 S! 



43 



4-2. 



41 



51 



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31^ 



BERG&AROUNt>TAIL NAYI5-3I 



Zik^Z 





3 4 £y 



AS 

 =Ffl-<l4 



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4-2> 



42 



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52. 



51 



So. 



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(!ven one accustomed to the ice regions. Every year there are a 

 num})er of these mistaken reports, which, unless carefully analyzed, 

 ^yill lead the patrol ship on "wild goose" searches. 



Siirfdce lemperaiure condltionfi. — The cold wall during the first 

 half of tlie month ran from lat. 43°, long. 53° 10', to lat. 40° 50', 

 long. 48°, when it turned sharply northward and thence in a north- 

 eastei-ly direction. The suggestion of the southeast wedge-shaped 

 form of the cold water during the first part of the month became a 

 wcll-dovolopod concHtioii by May 20. (See chart "K.") It is be- 



