122 MARIOX EXPEDITION TO DAVIS STRAIT AXD BAFFIX BAY 



This theory was first suggested by Barnes as a result of liis observa- 

 tions on ice formations on rivers. Anchor ice, for example, in the 

 St Lawrence River is known to rise to the surface at the first early 

 rays of dawn. If such relatively feeble light waves are capable of 

 loosening great masses of anchor ice from its moorings, they niin;lu 

 easily play an important part in breaking up icebergs. 



Barnes (1927. p. 16'2) impressed with the belief that a small 

 amount of i)enetrating energy from the sun sets up disruptive strains 



THELASTSTAGESOFAN iceberg NEARTHESTEAMSHIPLANES 



Figure 81. — This berg, on .Tune 22. 1922, in latitude 41' *^-*' •^•■ 

 longitude 49° 45' W., south of the Grand Bank in the northern 

 edge of the (Julf Stream, l)roke up completely within a few hours 

 time. The disintegrated part, now in tli<' torm ot growlers, 

 entirely melted witliin 12 hours, and the menace was removed 

 from the ice patrol broadcast. lOfiicial photograph, interna- 

 tional ice patrol. ) 



in icebergs, carried out a number of experiments to test the ertects o 

 large quantities of heat. During the summer of 192(5 (see liarneN 

 1927a) several icebergs were boarded along the east coast ot M ■ 

 foundliiud near Twilliiigate. and a slow-burning explosive tjuuni 

 thermit was buried to a depth of 3 feet and more in the ice. lar^^ 

 of a lai-ge plateau forming a major portion of one of the iceneri.- 

 disintegrated when a charge of I'Oi) pounds of thermit ^^'^^ /f""? ' 

 Lond cracks and loai-s continued throiiiiliont that night aiul l».v t" 



