-306 



W. H. WARREN. 



Table IV. 







Compressive 





Coefficient of 



Breaking 



Composition. 



Age in 



stress in lbs. 



Compression 



Elasticity in 



load lbs. 





days. 



per sq. inch. 



■00u8 inch. 



lbs. per sq. inch. 



per sq. in. 



r 



28 



410 



0-75 



4640000 



2985 







905 



2-00 



4215000 









1650 



4-00 



3970000 







28 



285 



0-75 



2973300 



2923 







620 



2-00 



2790000 









1120 



4-00 



2645000 









1560 



600 



2496600 









1993 



9-00 



2145500 





1 cement to < 













2 sand 



91 



315 



0-75 



3373300 



3557 







795 



2-00 



3665000 









1450 



4-00 



3470000 









2130 



6-50 



1643000 







381 



360 



0-50 



5960000 



4640 







1140 



2-00 



5390000 









2020 



4-00 



4895000 





, 





3320 



750 



4344000 





r 



" 28 



280 



0-75 



2906600 



2196 







560 



2-00 



2490000 









970 



4-00 



2270000 









1305 



6-00 



2071600 









1730 



975 



1710900 







29 



220 



0-75 



2106600 



2003 







440 



2-00 



1890000 









720 



4-00 



1615000 









980 



6-00 



1530000 









1360 



950 



1366000 







91 



320 



0-75 



3440000 



2923 







660 



2-00 



2990000 









1135 



4-00 



2682500 









1540 



6-00 



2463000 





1 cement to < 





1925 



8-25 



2258000 





3 sand 















91 



130 



0-75 



906600 



2643 







505 



200 



2215000 









955 



400 



4465000 









1345 



600 



3207500 









1855 



925 



2983300 







423 



280 



050 



4360000 



2115 







940 



200 



4390000 









1710 



4-00 



4120000 









2115 



525 



3910400 







379 



160 



050 



1960000 



3129 







610 



2-00 



2740000 









1140 



4-00 



2695000 









1860 



7-25 



2480000 





