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A portcullis (from Old French porte coleice 'sliding gate') is a heavy, vertically closing gate typically found in medieval fortifications. [1] A portcullis gate is constructed of a latticed grille , made of wood or metal or both, which slides down grooves inset within each jamb of the gateway.
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
Most locks are closed by chevron or mitre gates rather than by caissons. These are pairs of hinged gates that form a "V" shape, with the deeper water outside the V. Water pressure thus holds them closed. These gates can be opened and closed quickly, so they are used for canal locks, to change levels, and also for most freight docks.
The lock is on the Rufford branch of the Leeds and Liverpool Canal, it is in sandstone and has wooden gates. There are steps at the north end of west side, and a wooden footbridge over the lower entrance. [41] II: Wash-house building, Needless Inn Farm
Flight of six locks, in a quite ornate setting and including the UK's second deepest lock, [1] two pumping stations and several Grade II listed buildings. Bingley Five Rise Locks: Leeds and Liverpool Canal: grid reference: These staircase locks are the steepest flight of locks in the UK, with a gradient of about 1:5. Bow Locks: River Lee Navigation
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