I¥. W. E. COOK. 
PROF. SHERMAN | 
1 PART oF CEMENT ro 3 of SAND ¢ CLAY 
TENSILE STRENLCTH IN LBS PER S€. IN. 
4.2 3s 6 g l2 
ACE 1M MONTHS 
after six months or one year. Two diagrams are copied 
showing—(1) The curves of cement standard sand and 
clay; and (2) The curves of cement standard sand and 
loam. It will be seen that generally the higher the per- 
centage of clay or loam, the greater the strength. 
