400 



(0 

 D 



Plate 93 



1898 



O 



CVJ 



350 



300 



250 



Tensile strength, in pounds per square inch, shown by mortar briquets 

 Portland briquets contain 3 sand, 1 cement. 

 Natural briquets contain 1 sand, 1 cement. 



RESULTS OF TESTS FOR TENSILE STRENGTH 



