Saturday, April 24, 2004

Canals And Inland Waterways, Boat lifts

Vessels can be transported floating in a steel tank or caisson between adjacent pounds by a vertical lift, replacing several locks. Vertical lifts can be operated by high-pressure hydraulic rams, by submersible floats, or by geared counterweights. Hydraulic lifts with twin caissons were constructed in 1875 at Anderton, Eng., with a 50-foot lift for 60-ton vessels; in 1888 lifts were

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