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lki .E.. L.ow 2 21718-Extreme North End of Lower Lock Showing Immense Steel Monolith Forms on Tracks, Used in Construction Work, Gatun, Panama Canal. An idea of the immensity of the lock walls may be gained by carefully observing the large monolith forms, with seven different platforms, which are used in their construc- tion. The walls at Gatun, as well as at the Pedro Miguel and Miraflores locks, are of concrete. The spillway from the Gatun Dam to the tide-water level will be an opening lined with concrete also. In this spillway there will be 225,000 cubic yards of concrete. To regu- late the water-level in the lake the spillway will be closed by a dam of concrete. The dam will be regulated by gates. The width of the spillway is 300 feet, and the length, 1200 feet. It is cut through a veritable hill of rock, just near the center of the large Gatun Dam. The Gatun Dam forms a break-water to the Gatun Lake, whose surface will be 80 feet above the bottom of the lowermost lock. This dam is constructed from a natural com- bination of clay and sand. These have been dredged by hydraulic processes from neigh- boring pits, and then placed between two large masses of rock and other similar ma- terial, Copyright 1ptg, by Keystone View Company. ~t2~-:L.I -. ..' I I' -- |
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