1!)12] 



oil Tcrbenjs and, their Loratutn, in jVavif/ation,. 



y.'>: 



markable, since for hundreds of miles the variations were not more 

 than a quarter of a degree. The complete absence of any diurnal 

 variation of temperature was clearly marked. 



- The tests have shown that large variations of sea temperature are 

 caused only by some abnormal condition. Thus land affects it, 

 icebergs produce characteristic disturbances, and current boundaries 

 are clearly shown. The existence of a submarine hot spring was 

 indicated when passing over the great wall of the continental shelf 



miles 



Pig. 5.— Micho-thermogram of the Iceberg Effect from Record made 

 ON the Micro-thermometer on Canadian Northern Steamship 

 " Royal George." 



about 400 miles from the Irish coast. The bottom of the ocean 

 rises quickly here from about three miles to one-third of a mile. 

 Just over this wall the temperature rose rapidly to a sharp peak 

 about one and a half degrees warmer than the surrounding sea and 

 immediately fell again. Fig. 6 shows this disturbance very 

 clearly marked. It shows the peak superimposed on the small 

 variations characteristic of the open sea. 



