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Draw dock
Encyclopedia
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Some draw docks, such as the one on the right bank of the Thames at Raven's Ait
Raven's Ait
Raven's Ait is an ait in the Thames at Surbiton, in the Royal Borough of Kingston upon Thames, London, England, in the reach above Teddington Lock. It is situated upstream of Queen's Promenade where it departs from the river, and opposite Thames Sailing Club, home of the Thames A Class Raters...
in Surbiton, are simply wide slipways, others have gates, and boats float into them.