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The Weurt lock has an additional gate near the centre of the chamber. When only a few short boats want to go through the lock, they can use one half the chamber, saving water. Furthermore, when one of the gates is taken out of service for maintenance, the lock can still function at reduced capacity.
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.
The gates at both ends of the upper chamber are doubled for safety. Miraflores locks Gate-operating mechanism. The gates separating the chambers in each flight of locks must hold back a considerable weight of water, and must be both reliable and strong enough to withstand accidents, as the failure of a gate could unleash a flood of water ...
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A metal doorframe with a strike plate built in: in other doors this would be a metal strikeplate in a wooden doorframe. The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door ...
Locks on the National Register of Historic Places (1 C, 7 P) Pages in category "Locks of the United States" The following 7 pages are in this category, out of 7 total.