riate 94 



to 



O 

 no 



1800 



400 



350 



300 



250 



^OQ 



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 



«3 

 >s 







-a 

 00 



