61 



medical advice by radio, and three were furnished weather reports. 

 L^'our hundred and fifty-three steamships cooperated with the patrol 

 :his year, the names of which, and their masters, have been recorded 

 in order that each one may appropriately be recognized. It was 

 found that 64 per cent of the steamers on the North Atlantic routes 

 ^vere equipped with radio apparatus to receive continuous wave 

 oscillation and occasional broadcasts; advised shipping that it was 

 he intention of the patrol to broadcast all information on a con- 

 inuous-wave next year. 



Physical oceanographic investigation of the waters of the ice 

 I'egions was carried on throughout the season of 1924 whenever op- 

 portunity offered. This work extended from the forty-first parallel to 

 he entrance of the Strait of Belle Isle, Newfoundland. The sub- 

 ;urface investigations penetrated to a depth of 750 meters, the limit 

 jf active circulation. A total of 121 stations were occupied this 

 season compared Avith 103 for 1923; the number this year exceeding 

 ill previous records. 



The electric salinity apparatus installed was carried on board the 

 Tampa and 622 tests were made on board throughout the season. 

 Ihis is the first authentic known record of salinities of the ocean 

 jeing determined on board ship in any such great number, and being 

 1 practical instrument for determination of salinity on shipboard 

 it is recommended for consideration in equipping other oceano- 

 ^raphical expeditions. A detailed description of the apparatus is 

 :-arried on page 136. 



The oceanographic data is being treated and discussed under 

 appropriate headings appearing further on in this publication. 

 Records of surface thermal conditions, amounts of fog, directions of 

 ;^•ind, drift ice, and other pertinent phenomena are shown by various 

 ?harts, sketches, and also are discussed in detail under their respec- 

 :ive headings to which the reader so interested may easily refer. 



10761—24 5 



