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2. Warded lock - Wikipedia

   en.wikipedia.org/wiki/Warded_lock

   Double-sided ward locks nearly always have perfectly symmetrical bits. For single-sided locks, a cylindrical post is typically located in the center of the lock. Its purpose is to provide a point of leverage and pivot for rotating the key, and to help correctly align the key with the wards. The key has a corresponding hole which fits over the post.

3. Lock (water navigation) - Wikipedia

   en.wikipedia.org/wiki/Lock_(water_navigation)

   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.

4. Garston Lock - Wikipedia

   en.wikipedia.org/wiki/Garston_Lock

   One of only two remaining working examples of turf sided locks on the canal [2] (the other being Monkey Marsh Lock [3]), Garston Lock has been described as needing "more water to operate than the now more common brick or stone-sided variety" as the sloping sides increase the volume of the lock. [4] The two sets of lock gates work differently ...

5. Lever tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Lever_tumbler_lock

   The lock is made up of levers (usually made out of non-ferrous metals). Each lever needs to be lifted to a specific height by the key in order for the locking bolt to move. [1] Typically, the belly of the lever is cut away to various depths to provide different combinations, or the gate is cut in a different location, to provide differs.

6. Caisson lock - Wikipedia

   en.wikipedia.org/wiki/Caisson_lock

   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 ...

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