11 



generator. Both the T-2 2-kilowatt tube transmitter and the XA 

 500-watt high-frequency set, in consequence, were out of commission 

 for three days until repairs were completed. The Tampa, fortu- 

 nately, carried spare generator parts on board for just such an emer- 

 gency. The trouble caused no delay, however, in the reception of 

 ship reports, because a separate power supply is used in connection 

 with the spark transmitter for the purpose of ship-to-ship com- 

 munication. 



The radio electrician in charge of ice patrol communications, and 

 detailed to remain continuously at sea, was taken seriously ill during 

 the first part of the ice season, and it was necessary for him to return 

 to Boston for treatment. The vacancy thus created was filled by a 

 radio man, first class, assigned from the personnel of the Tampa, 

 who transferred from ship to ship for the remainder of the patrol. 



The amount of ice patrol traffic handled by radio is always inter- 

 esting and indicative of the importance of this work to the success of 

 the patrol. There were approximately 5,548 reports received from 

 passing steamers concerning their position, course, speed, and sea- 

 water temperatures. A total of 380 official messages were trans- 

 mitted to Washington, and 84 were received. It is estimated that 

 a total of 274,407 words were handled during the season of 1927 

 (see p. 15). 



There is appended herewith a schedule giving the times at which 

 messages were received and sent by the patrol vessel. This schedule 

 was adopted after several preliminary tests in 1926, and, as outlined 

 here, was found quite satisfactory for the season of 1927. 



(All times are seventy-fifth meridian) 



0600. Ice broadcast (spark) ; call on 600 meters, then send twice on 706 meters 



with a 2-minute interval. 

 0700. Ice broadcast (continuous wave) ; call on 600 meters, then send twice on 



1,713 meters with a 2-minute interval. 

 0730. Clear aU ship-to-shore traffic mth Washington (NAA). Ice patrol using 



410 kilocycles. 

 0800. Clear all ship-to-shore traffic with Bar Harbor (NBD) in case the 0730 



schedule fails. Ice patrol using 1,713 meters. 

 0915. Copy Cape Race weather and obstruction broadcast. 

 1030. Copy Arlington weather broadcast. 



1200. Copy time signals and ice patrol traffic from Arlington (NAA). 

 1800. Ice broadcast (spark) ; call on 600 meters, then send twice on 706 meters 



with a 2-minute interval. 

 1900. Ice broadcast (continuous wave); call on 600 meters, then send twice on 



1,713 meters with a 2-minute interval. 

 1930. Clear all ship-to-shore traffic with Washington (NAA) on high frequency. 

 2000. Clear all ship-to-shore traffic with Bar Harbor (NBD) in case the 1930 



schedule fails. Ice patrol using 1,713 meters. 

 2115. Copy Cape Race weather broadcast. 



2200. Copy time signals and ice patrol traffic from Arlington (NAA). 

 2230. Copy weather broadcast from Arlington (NAA). 



