3= 



& Jfs#&i\ D D D P D 



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A CROSS-SECTION OF A LOCK CHAMBER AND WALES, GATUN LOCKS, SHOWING HOW 

 THE LOCKS ARE FILLED AND EMPTIED 



A. Culvert in center wall. E. Culvert in side wall. 



B. Connections between center and lateral F. Drainage gallery. 



culvert. G. Gallery for electric wires. 



C. Lateral culvert. H. Passageway for operators. 



D. Wells opening from lateral culverts into lock chamber. 







— ^ , ._ 



"" ' " 







.. .1.,. 





THE SIDE WALL OF ONE OF THE GATUN LOCKS COMPARED TO A SIX-STORY BUILDING 



The size of the culverts may be appreciated from the engine and dray. The "steps" have 

 been filled in with earth and stone and graded to the top 



181 



