Plate 92 



400 



350 



300 



250 



BOO 



ISO 



ICG 



50 



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 



