34 



MR. W. FAIRBAIRN ON THE 



The results of the experiments 1, 2, 3, 9, 10, fractured 

 and crushed in the line of cleavage, are given in the following 

 table. 



Experiments to determine the force required to fracture, 

 and subsequently to crush, 2in. cubes of sandstone from the 

 Shipley and other quarries, near Bradford. Pressure being 

 applied at right angles to the cleavage. 



