46 



hours when the steamship lanes were menaced. A daily ice report 

 was sent to the Hvdrographic Office, and weather reports were made 

 twice daily to the Weather Bureau at Washington. 



During this cruise an aggregate of 1 .3 Hi water tem})erature reports 

 were received . 



COAST GUARD CUTTER ' MODOC," COMMANDER B. M. CHISWELL, ICE 

 PATROL, THIRD CRUISE, JUNE 1-16, 1923. 



The Modoc sailed from Halifax at 11.45 a. m., May 30. and met 

 the Tampa at 5.20 p. m.. Jun(> 1 , in lat. 43° 04', long. 54° 16'. The 

 oceanographic observer was transfeiTed to the Modoc-, which then 

 relieved the Tampa on the ice patrol. 



During the night of May 30 the wind, which had been moderate 

 SE., backed into NE. and N. and increased to moderate gale force 

 on the 31st, with rough sea. On the night of the 31st it continued 

 backing, going to WNW. and then to SW.. decreasing in force to 

 strong and fresh breezes on June 1 . 



On June 1, having relieved the Tampa, at 5.55 p. m. we headed for 

 the berg that she had passed in the morning in lat. 43° 01', long. 

 53° 38', and at 9.05 p. m. stopped to leeward of same to drift during 

 darkness. Ice infc^-mation was furnished the st(>amsliip Bremen. 



After conferences with the wireless officer, Department of Marine 

 and Fislieries, Halifax. Nova Scotia, relative to duplicati(m and con- 

 fusion resulting from broadcasting North Atlantic ice information 

 by the ice patrol vessels and Cape Race, a satisfactor}- agreement 

 was reached by which duplication of effort would be avoided for the 

 remainder of the season. 



June 2: Wind WSW. to W., of moderate gale force decreasing to 

 ■fresh breezes by night, with rough sea. Barometer falling until 5 

 p. m., when it stood at 29.59, after which it rose slowly to 29.08 by 

 midnight. Weather was overcast and cloud}-, with poor visibility. 

 The sea was heavier than the force of the wind would lead one to 

 expect, indicating a heavy blow to the westward. The vessel drifted 

 to leeward of the berg of last night, awaiting an opportunity to deter- 

 mine its line and rate of drift. About 5 p. m. a rather large piece 

 broke off from one end of the berg, resulting in one large growler and 

 several small ones. One of the small growlers drifted to leeward 

 faster than the ship. This is difficult to understand, as the ship and 

 the growler must Iiave been approximately equal as to depth in the 

 water and therefore actuated by the same surface current, if any, but 

 the growler's exposure to the wind was less than 10 per cent of the 

 ship's. The large growler, on the other hand, lemained in the 

 vicinity of the berg. The ship's (hifl to Iccwanl from the berg was 

 approximately 1 knot per hour 



