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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.
When closed, the top of the caisson often provides a convenient bridge across the dock. Unlike the chevron gate, this bridge is straight and so may be used for vehicle traffic. [iii] Busy gates, such as for a canal lock, may have dock sides high enough that the caisson can run beneath them. In this case, the roadway on top of the caisson, or ...
The parts included in the typical US mortise lock installation are the lock body (the part installed inside the mortise cut-out in the door); the lock trim (which may be selected from any number of designs of doorknobs, levers, handle sets and pulls); a strike plate (or box keep), which lines and reinforces the cavity in the door jamb or frame ...
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 ...
A failure of the lock gates—for example, caused by a runaway ship hitting a gate—could unleash a flood on the lands downstream of the locks, as the lake above the locks (Gatun Lake or Miraflores Lake) drains through the lock system. Extra precaution against this is provided by doubling the gates at both ends of the upper chamber in each ...
A false gate is a mechanical element on levers in lever tumbler locks or discs in disc tumbler locks to make the lock more difficult to pick. Glass relocking device A glass relocking device is a piece of glass , usually tempered, placed where it might be expected to break in a burglary attack.
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