66 HYDRAULIC PRESSES AND LIFTS . ing tlie wronght iron bottom - skin of the aqueduct upon a cast iron bed - plate that is built into the masonry with a layer of red lead between . The outer edges are caulked with wooden wedges , and the sides are run with Portland cement . Each end of the ANDERTON… … Fig . 13 . aqueduct is fitted with wrought iron lifting - gates , made water - tight by indiarubber strips fitted between tliem and the aqueduct . Each gate weighs 27 cwt . , and is counterbalanced by weights , B ( fig . 12 ) . The lifting of a gate can be effected in a minute and a
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