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Caisson lock. The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower ...
A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow it to be towed clear of the dock. Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons.
The wharf, or boat dock, was established on Alcatraz in the 1850s to permit the landing of men and building materials to construct a fort completed in 1859. In 1867, the General McPherson was built to serve the island and other military institutions in the San Francisco Bay Area, as Alcatraz became a long-term military prison from 1868. The ...
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Coordinates: 52.52309°N 2.07761°W. The boat dock. The boat dock at the Black Country Living Museum was built in 1976. [1] Like many boat docks in the region its buildings are made out of recycled boat timbers from derelict wooden boats. The thousands of boats that used to work the Black Country canals all needed constant maintenance.
Sheerness Dockyard. View from Garrison Point Fort across the Gun Wharf and Boat Pond, Sheerness Dockyard, 1941. The Navy Board (until 1832); the Admiralty (after 1832). Sheerness Dockyard was a Royal Navy Dockyard located on the Sheerness peninsula, at the mouth of the River Medway in Kent. It was opened in the 1660s and closed in 1960.
Wharf - Wikipedia ... Wharf
Half tide dock. A half tide dock is a partially tidal dock. Typically the dock is entered at high tide. As the tide ebbs a sill or weir prevents the level dropping below a certain point, meaning that the ships in the dock remain afloat, although they still rise and fall with the tides above this. Half tide docks are particularly useful in areas ...
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