
(from the article `dock`) Floating pontoon docks, of which few have been built, rise and fall with the water level. One such dock floats up or down guided by walls of ... At first sight, the solution might appear to be to support the outer end of the link span on a float, or pontoon, so that it would automatically ... [2 related arti...
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http://www.britannica.com/eb/a-z/p/93
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