Banks, more valuable information could be furnished approaching 

 vessels, especially during the protracted periods when fog enshrouds 

 the cold-water regions. Since nearly all the bergs at this gateway to 

 the Atlantic are controlled by a relatively deep-seated circulation, a 

 current map of the critical area where the Labrador current and the 

 Gulf Stream meet, is an indicator of the courses menacing bergs will 

 follow. A practical means of determining oceanic circulation in 

 critical areas was instituted for the first time with the season of 1926. 

 (See pp. 108 to 117.) The methods of this work ^ are set forth in a 

 pamphlet recently published by the Coast Guard. 



After the ice was located the patrol began transmitting fom- 

 daily radio broadcasts, giving ice information for the benefit of ship- 

 ping, each broadcast being repeated once with an interval of two 

 minutes between the messages. The times at which these broad- 

 casts were sent and also the wave lengths used are given below : 



In addition to this service ice information was given to any ship 

 that made inquiry and in cases where vessels were standing danger- 

 ously close to ice, the patrol sent them a special message. 



The ice patrol in transmitting routine dispatches to Washington 

 operated under the following schedule which had been arranged before 

 the ships sailed from port. After getting the "XA" set in working 

 order a slightly modified schedule superseded the one here. (See 

 p. 16.) 



Green- 

 wich 

 civil 

 time 



Time, 

 seventy- 

 fifth 

 meridian 



1300 

 1700 

 1800 

 0100 

 0300 

 0330 

 0400 



0800 

 1200 

 1300 

 2000 

 2200 

 2230 

 2300 



Ice patrol transmits Weather Bureau report to Bar Harbor on 175 kilocycles (1,713 



meters), using the "no answer" method. 

 Washington transmits "no answer" method acknowledgement for 0800 schedule on 



113 kUocycles (2,650 meters). 

 Ice patrol receipts by "no answer" method to Bar Harbor receipt for Washington's 



1200 schedule. Use 175 kilocycles (1,713 meters). 

 Ice patrol transmits "no answer" method to Bar Harbor on 175 kilocycles (1,713 meters), 



dispatch for Weather Bureau and Hydrographic Office. 

 Washington transmits "no answer" method acknowledgement for 2200 schedule on 



113 kilocycles (2,650 meters). 

 Washington transmits "no answer" method, a weather forecast for the ice patrol, 113 



kilocycles (2,650 meters) . 

 Ice patrol receipts by "no answer" method to Bar Harbor for Washington's 2230 and 



2300 schedules. 



1 Smith, Edward H.: 

 No. 14. 



'A Practical Method of Determining Ocean Currents." U. S. Treas. Dept. Bull. 



