A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself that rises and falls.
The River Weaver is a river, navigable in its lower reaches, running in a curving route anti-clockwise across west Cheshire, northern England. Improvements to the river to make it navigable were authorised in 1720 and the work, which included eleven locks, was completed in 1732. An unusual clause in the enabling Act of Parliament stipulated that profits should be given to the County of Cheshire for the improvement of roads and bridges, but the navigation was not initially profitable, and it was 1775 before the first payments were made. Trade continued to rise, and by 1845, over £500,000 had been given to the county.
A diving bell is a rigid chamber used to transport divers from the surface to depth and back in open water, usually for the purpose of performing underwater work. The most common types are the open-bottomed wet bell and the closed bell, which can maintain an internal pressure greater than the external ambient. Diving bells are usually suspended by a cable, and lifted and lowered by a winch from a surface support platform. Unlike a submersible, the diving bell is not designed to move under the control of its occupants, nor to operate independently of its launch and recovery system.
Sharpness is an English port in Gloucestershire, one of the most inland in Britain, and eighth largest in the South West. It is on the River Severn at grid reference SO669027, at a point where the tidal range, though less than at Avonmouth downstream, is still large.
A loading dock or loading bay is an area of a building where goods vehicles are loaded and unloaded. They are commonly found on commercial and industrial buildings, and warehouses in particular. Loading docks are part of a facility's service or utility infrastructure, typically providing direct access to staging areas, storage rooms, and freight elevators.
The Port of Antwerp is the port of the City of Antwerp. It is located in Flanders (Belgium), mainly in the province of Antwerp but also partially in the province of East Flanders. It is a seaport in the heart of Europe accessible to capesize ships. It is Europe’s second-largest seaport, after Rotterdam. Antwerp stands at the upper end of the tidal estuary of the Scheldt. The estuary is navigable by ships of more than 100,000 Gross Tons as far as 80 km inland. Like the Port of Hamburg, the Port of Antwerp's inland location provides a more central location in Europe than the majority of North Sea ports. Antwerp's docks are connected to the hinterland by rail, road, and river and canal waterways. As a result, the port of Antwerp has become one of Europe's largest seaports, ranking second behind Rotterdam by total freight shipped. Its international rankings vary from 11th to 20th (AAPA). In 2012, the Port of Antwerp handled 14,220 sea trade ships, 57,044 inland barges, and offered liner services to 800 different maritime destinations.
A ballast tank is a compartment within a boat, ship or other floating structure that holds water, which is used as ballast to provide hydrostatic stability for a vessel, to reduce or control buoyancy, as in a submarine, to correct trim or list, to provide a more even load distribution along the hull to reduce structural hogging or sagging stresses, or to increase draft, as in a semi-submersible vessel or platform, or a SWATH, to improve seakeeping. Using water in a tank provides easier weight adjustment than the stone or iron ballast used in older vessels, and makes it easy for the crew to reduce a vessel's draft when it enters shallower water, by temporarily pumping out ballast. Airships use ballast tanks mainly to control buoyancy and correct trim.
The Stainforth and Keadby Canal is a navigable canal in South Yorkshire and Lincolnshire, England. It connects the River Don Navigation at Bramwith to the River Trent at Keadby, by way of Stainforth, Thorne and Ealand, near Crowle. It opened in 1802, passed into the control of the River Don Navigation in 1849, and within a year was controlled by the first of several railway companies. It became part of the Sheffield and South Yorkshire Navigation, an attempt to remove several canals from railway control, in 1895. There were plans to upgrade it to take larger barges and to improve the port facilities at Keadby, but the completion of the New Junction Canal in 1905 made this unnecessary, as Goole could easily be reached and was already a thriving port.
Lock and Dam No. 19 is a lock and dam located on the Upper Mississippi River near Keokuk, Iowa. In 2004, the facility was listed in the National Register of Historic Places as Lock and Dam No. 19 Historic District, #04000179 covering 1,605 acres (650 ha), 7 buildings, 12 structures, 1 object. The lock is owned and operated by the U.S. Army Corps of Engineers. The dam is owned and operated by Ameren Missouri.
Karl Johanslussen is a lock and a sluice, along the Söderström river connecting and controlling the flood discharge between Riddarfjärden, the easternmost part of Lake Mälaren, and Saltsjön, the section of the Baltic Sea reaching into central Stockholm, Sweden. The lock is 75 metres long, 10 metres wide and 3.90 metres deep. The maximum height is 3.8 metres. The lock is closed from 2016 to 2021 due to large reconstruction works in the area.
The Henrichenburg boat lift facilitates a change in elevation of the Dortmund-Ems-Kanal in Waltrop-Oberwiese. The boat lift is part of the Waltrop Lock Park (Schleusenpark), which includes the old Henrichenburg boat lift built in 1899, a disused shaft lock from 1912, the new boat lift built in 1962 and a modern ship lock from 1989.
The Berendrecht Lock is the world's second largest lock, provides access to the right-bank docks of the Port of Antwerp in Belgium.
BOKA Vanguard is a semisubmersible heavy-lift ship owned and operated by Dockwise B.V. Dockwise Vanguard is the largest vessel of her type ever built, and is able to carry cargoes up to 110,000 tonnes. Dockwise Vanguard was designed to move offshore oil and gas facilities, but can also carry other ships and act as an offshore dry-dock facility.
SS Kanguroo was a French heavy-lift ship built to transport submarines before World War I. She delivered submarines to Brazil and Peru before the war began. Requisitioned in 1914 by the French Navy, she was torpedoed by a German submarine in late 1916 and sunk at Funchal, Madeira.
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.
Vlissingen Naval Base was a base for the Admiralty of Zeeland, and later the Dutch Navy. It has a number of major marine facilities of historic significance. It housed a shipyard for the Admiralty of Zeeland, and the national shipyard Rijkswerf Zeeland. Shipyard de Schelde would take over the grounds of the Rijkwerf, and still continues to build warships as Damen Schelde Naval Shipbuilding.
The Dehler 22 is a West German trailerable sailboat that was designed by E. G. van de Stadt and first built in 1983. It is van de Stadt's design number 374.
The Dehler 25 is a German trailerable sailboat that was designed by E. G. van de Stadt as a cruiser and first built in 1984.
The Terrapin 24 is an American trailerable sailboat that was designed by Dave Westphal as a cruiser and first built in 1973.
