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
posted by PoliticalCushion @ 2:45 PM
