THE PANAMA CANAL 



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RECEIVING THE CONCRETE 



Note the men standing on' top of the wall on the extreme left. The largest amount of 

 concrete laid in any one month at Gatun is 89,401 cubic yards. The average cost of the con- 

 crete per yard in place for 1910 was $7-355, including plant charges and division expenses. 

 To build the Gatun locks 2,250,000 barrels of cement will be required. 



be noted that the maximum lift for these 

 locks is about 65 feet. The excavation 

 for the upper set of locks is complete 

 and for the lower set it is about 70 per 

 cent complete. It was not intended to 

 lay any concrete until the plant at Pedro 

 Miguel had finished the locks at that lo- 



cality, but, as the work has advanced so 

 much more rapidly than anticipated, and 

 as the contractors are to complete the 

 erection of the gates seven months ear- 

 lier than expected, it became necessary 

 to install auxiliary mixers and begin this 

 part of the work earlier. There will be 



