SCIENTIFIC RESULTS 



103 



The Dry-Dock or Valley Type of Berg 



Figure 63. — An iceberg sighted by the international ice patrol ali'out 25 miles south- 

 west of the Grand Bank floating in water of 30° F. The " valley " or dry-dock 

 lierg is one of the common types sighted south of Newfoundland during the ice 

 season. The continual surging of the waves and swell develop a central bore and 

 later a deep, wide vallev such as depicted here. Compare the water-washed 

 polished surface of The iinderportion of the berg with the rugged air-exposed 

 upper parts. (Oflicial photograph, international ice patrol.) 



A Characteristic Form of Melting 



Figure 64. — All bergs drifting into the North Atlantic melt 

 most rapidly at the water line, as shown above. This 

 small berg was lirst sketched April 13. 1913, in the mixed 

 water around the Grand Bank. The second sketch shows 

 the I'ffects of three weeks of melting. 



121)860—31- 



