18 



weather. The Champlain sailed from JuHanahaab September 14 and 

 entered the Strait of Belle Isle September 16, where the surface ob- 

 servations were discontinued. After the return of the Champlain 

 the salinities were determined by titration by Mr. Alfred Woodcock, 

 of the Woods Hole Oceanographic Institution. The table of tempera- 

 tures and salinities of this cruise appears on page 88 of this bulletin. 



RADIO 



The radio apparatus used on the Mendota and Pontchartrain was 

 practically the same type used by the patrol vessels in 1933 and 1932. 

 On the General Greene was installed a high-frequency transmitter with 

 range from 8,200 to 17,100 kilocycles and receiver with range from 

 2,000 to 23,000 kilocycles, which enabled her to communicate directly 

 with NAA, the United States naval radio station, Arlington, Va. 

 During the season the radio apparatus functioned satisfactorily with- 

 out serious breakdown. 



Ice information was broadcast to shipping at 0100 and 1300 G. C. T. 

 on 175 kilocycles and at 1100 and 2300 G. C. T. on 425 kilocycles. 

 Each of these broadcasts were repeated immediately after the first 

 sending. Schedules were maintained with NAA, United States naval 

 radio station, Arlington, Va., at 1200, 0000, and 0230 G. C. T. At 

 the 0000 schedule each day a summary of the latest ice information 

 was sent to the Hydrographic Office of the Navy. In case of a failure 

 to establish communication with NAA at a scheduled time our traffic 

 was routed through the commercial radio stations at Chatham, Mass., 

 or Sayville, N. Y. During the season 6,199 weather and water tem- 

 perature reports were received from ships passing through the ice- 

 patrol area. A total of 610,532 words were sent and received by the 

 Mendota and Pontchartrain while on ice-patrol duty. This averages 

 5.6 words per minute during the entire time of the patrol. In addition 

 the General Greene sent and received 92,783 words while on oceano- 

 graphic work and ice-observation duty. This gives some indication 

 of the large volume of radio traffic handled by the ice-patrol vessels 

 and the importance of radio in conducting the ice patrol. 



WEATHER 



The weather conditions experienced by the patrol cutters are shown 

 by the accompanying diagrams (figs. 9 to 11). As very little ice 

 drifted south of latitude 44°, the patrol cutters remained somewhat 

 farther north than usual but farther south than last year (1933). 

 Latitude 44° 30' N, longitude 48° 30' W., can be taken as the mean 

 position of the observations. During most of the time the vessels 

 remained within 100 miles of this position; however, on several occa- 

 sions they were 200 miles away. The track of the patrol vessels with 



