536 



Professor Howard T. Barnes 



[May 31, 



The result of these experiments brings out several points of 

 importance. The iceberg effect was clearly obtained when passing, 

 early in the afternoon, into the ice track. Fig. 5 shows this very 

 well even in water nearly at ;-i2° F. The ship's course was altered 

 here to avoid a large berg, and when abeam of two immense icebergs 

 situated approximately 10 miles on either side of the ship, the micro- 

 thermometer showed its minimum reading, and as the bergs were left 



Fig. 4. — Marine Miceo-thermogeam, showing Effect of Land. 



behind the temperature rose rapidly to a maximum, fell off again and 

 then rose steadily. No further ice was encountered until early 

 the following morning, when several icebergs were passed in water 

 measuring approximately 37" F. 



The sudden change of temperature on passing out of the Arctic 

 current into the (lulf Stream was clearly marked. Here a rise of 

 temperature of nearly 10" was recorded in a little over half an hour. 

 The great steadiness of the temperature of the Gulf Stream was re- 



