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Not to be confused with Caisson (lock gate).
Operation of caisson lockContemporary engraving of the lock at Combe Hay
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 canal boats through large height differences. Such locks, each of which would only raise and lower boats through small height differences of a few feet, would not suffice when large height differences had to be tackled nor when water was in short supply. The caisson (or caisoon) was thought to be one solution, although it transpired that the technology of the day was not capable of achieving this type of construction economically.
It was designed primarily as a water-saving measure, and also was an attempt to minimise construction costs compared with other engineering solutions of the time. In use it was capable of replacing up to seven conventional locks.[1] Other design benefits were speed of boat descent/ascent, and only a little loss of water when operating compared with a conventional boat lock.
^"Levels at Rowley Bottom". The Somersetshire Coal Canal Society. Retrieved 6 September 2013.
The caissonlock 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...
ceiling Caisson (engineering), a sealed underwater structure Caisson (lock gate), a gate for a dock or lock, constructed as a floating caissonCaisson (pen...
and a royalty of 4 pence per ton of goods passed. The design of the caissonlock at Combe Hay was not a success: on 15 February 1798 the first descent...
miles (2.6 km). The lock flight was predated in the immediate area by two other methods of canal lifts—first by a series of caisson locks, then by an inclined...
lift lock functions by gravity alone using the counterweight principle. One caisson always ascends and the other always descends during each locking cycle...
balanced water-filled caissons in Erasmus Darwin's Commonplace Book (pp. 58–59) dated 1777–1778 In 1796 an experimental balance lock was designed by James...
the vertical position, the locking mechanisms are activated. These include securing pins that are protruded into the caisson bases, and hydraulic clamps...
anymore. The old ship caisson was then stored in the dock, and a new ship caisson that fit the deformed lock was made. This new caisson had the serious disadvantage...
portal Canals of the United Kingdom History of the British canal system Caissonlock Hadfield, Charles (1967). The Canals of South West England. Daved and...
line to cross each other. Anderton Boat Lift Falkirk Wheel Combe Hay CaissonLock Hay Inclined Plane Foxton Inclined Plane Worsley Underground Incline...
plane to navigate Brogborough Hill Combe Hay Caissonlock Camden Lock, William Congreve's hydropneumatic lock. The inclined planes of Dukart's Canal Falkirk...
locks. Examples are the Anderton Boat Lift, Falkirk Wheel and Combe Hay CaissonLock. Inclined planes raise a canal boat up a hill on a track, powered by...
The Anderton Boat Lift is a two-caisson lift lock near the village of Anderton, Cheshire, in North West England. It provides a 50-foot (15.2 m) vertical...
published in 1788. He also inspired Robert Weldon's Somerset Coal Canal caissonlock. In 1792, Darwin was elected as a member to the American Philosophical...
workplace in a caisson or sealed tunnel. The airlock may need to be large enough to accommodate a whole working shift at the same time. Locking in is usually...
caissons made of southern yellow pine and filled with cement. Inside both caissons were spaces for construction workers. The Manhattan side's caisson...
sickness (DCS; also called divers' disease, the bends, aerobullosis, and caisson disease) is a medical condition caused by dissolved gases emerging from...
prospective caisson door bateau-porte (French) and Pumphouse. At the start of March brickwork was resumed. This time it was on the caissonlock, which also...
from the lock's northern caisson. Passengers aboard the Kawartha Voyageur, which was being raised up at the time, evacuated as the damaged lock was lowered...
Karl Johanslussen ("Lock of Charles John") is a lock and a sluice, along the Söderström river connecting and controlling the flood discharge between Riddarfjärden...
nitrogen bubbles releasing from the bloodstream (the bends, also known as caisson disease). Such problems can occur at pressures greater than 1.6 standard...
the dry dock. The solution for making a waterproof lock gate for a dry dock was the ship caisson or ship-door invented in France in 1683, but this solution...
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