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A pound lock has a chamber with gates at both ends that control the level of water in the pound. In contrast, an earlier design with a single gate was known as a flash lock. [4] Pound locks were first used in China during the Song dynasty (960–1279 CE), having been pioneered by the Song politician and naval engineer Qiao Weiyue in 984. [5]
In boating, a fender is an air-filled ball or a device in other shape and material used to absorb the kinetic energy of a boat or vessel berthing against a jetty, quay wall or other vessel. [1] Fenders, used on all types of vessels, from cargo ships to cruise ships , ferries and personal yachts , prevent damage to vessels and berthing structures.
A Phoenician joint (Latin: coagmenta punicana) is a locked mortise and tenon wood joinery technique used in shipbuilding to fasten watercraft hulls.The locked (or pegged) mortise and tenon technique consists of cutting a mortise, or socket, into the edges of two planks and fastening them together with a rectangular wooden knob.
Boats moving upstream would be winched or towed through the lock with the paddles removed. Considerable skill was involved both in removing the paddles in a timely manner and navigating the boat through the lock. Flash locks of this type have been documented in China since at least the 1st century BCE and on the Thames since at least 1295. [5] [6]
A rowlock cut into the top strake of a boat. In some, largely older, strict terminologies, a rowlock is a U-shaped cut-out in the top strake of a boat (usually the wash-strake). In older texts, the U-shaped metal fitting may be called an "oar crutch", a usage which is largely obsolete. [4]: 213–217 [5]
Staircase lock of eight locks constructed by Thomas Telford in 1811 lifting boats 64 feet (20 m). Tardebigge Locks: Worcester and Birmingham Canal: grid reference: Longest flight in the UK. 30 locks rising 67m. Tuel Lane Lock: Rochdale Canal: grid reference: Deepest lock in the United Kingdom, with a fall of 19' 8½". [1] Watford Locks
In this usage pattern, the paired locks offer redundancy during maintenance or in the event of mechanical issues. [3] 24-hour time-lapse of the upper chamber of the Miraflores Locks. The lock chambers are 110 ft (33.53 m) wide by 1,050 ft (320 m) long, with a usable length of 1,000 ft (305 m). [4]
2. A metal chair used for ship-to-ship personnel transfers at sea while underway. boatswain's pipe boatswain's whistle. See boatswain's call. boatwright A maker of boats, especially of traditional wooden construction. bob bobfly A pennant or flag bearing the owner's colors and mounted on the topsail trunk. [2] bobstay
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