[barnes-mackay] crushing STRENGTH OF ICE 



89 



Axis of Block A A — horizontal. 



Axis of Load, vertical. 



A fault extended across the block as shown by the slightly warped 

 surface F F F F. The bearing plates were chilled before the block 

 was placed in the testing machine. 



Log of Test. 



2,400 lbs. slight cracking. 



3,200 lbs. continued cracking. 

 12,000 lbs. vertical crack top to bottom. 

 25,000 lbs. ultimate load. 



25,000 



Ultimate strength = 



161 lbs. per sq. inch. 



14x 11-5 

 Block No. 1 splits into prisms and wedges as shown in Fig. 2. 



^9^- 



Block No. 2. 



Dimensions as shown in Fig. 3 

 Block tested with axis vertical, 

 cated by surface F F F F. 



This block had a fault as indi- 



