STATE GEOLOGIST. 1183 
for a thickness of two inches was of mortar, I cement to 2 sand. A 
careful force and expense account was kept of the work which was done in 
18'__Elev. gail, 
Land side River side 
iqinal 
Or 5 Suntan. 
~s 
“tv 
Section of Goncrete Levee Golumbus Ohio. 
Fig. 21.- 
two pieces, one of 185 feet and the other 60 feet in length. The cost of 
each is as follows: 
TABLE NO. 18. 
Cost of Levee wall at Columbus, O. 
Cost per cubic yard upon 
Items used in each cubic yard 
of Cone: ete. 
| 60 ft. length. 
185 ft. length. 
0.94 barrel Portland cement at $2.15.......... $2.021 $2.021 
1.10 cubic yards of crushed gravel at $0.75... . 0 825 0.825 
0.55 cubic. yard of sand at $1.25......... ..... 0.687 0.687 
Labor mixing—placing and ramming at $0.15 1.160 1.324 
Extra cost per yard, facing with 1 to3 mortar.. 0.264 | 0.221 
Costioflaborserecting forms... 0.265 0.232 
Cost of materials in forms............... tea 0.379 0.391 
Deterioration of tools and equipment......... 0 042 0.055 
Total cost per cubic yard........ tae $5,648 $5.756 
FORTIFICATIONS. 
Concrete is extensively used by the U. S. Government in the construc- 
tion of gun foundations and emplacements in magazine vaults, bomb 
