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2. 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.

3. Sheffield Lock - Wikipedia

   en.wikipedia.org/wiki/Sheffield_Lock

   The lock was built in the early 18th century and was originally turf-sided. It was enlarged in the mid 18th century to cope with larger "Newbury barges" [2] and has 20th century alterations. It consists of brick chamber walls of 11 scalloped bays, with brick coping and has 2 sets of double wooden gates, all with mechanical gate paddle gearing.

4. Latch - Wikipedia

   en.wikipedia.org/wiki/Latch

   A Suffolk latch is a type of latch incorporating a simple thumb-actuated lever and commonly used to hold wooden gates and doors closed. Comparison of Suffolk and Norfolk latches. The Suffolk latch originated in the English county of Suffolk in the 16th century and stayed in common use until the 19th century.

5. Wafer tumbler lock - Wikipedia

   en.wikipedia.org/wiki/Wafer_tumbler_lock

   A wafer tumbler lock is a type of lock that uses a set of flat wafers to prevent the lock from opening unless the correct key is inserted. This type of lock is similar to the pin tumbler lock and works on a similar principle. However, unlike the pin tumbler lock, where each pin consists of two or more pieces, each wafer in the lock is a single ...

6. Warded lock - Wikipedia

   en.wikipedia.org/wiki/Warded_lock

   Keys for some types of warded locks often have a characteristic symmetrical shape. The one on the right is a skeleton key. A warded lock (also called a ward lock) is a type of lock that uses a set of obstructions, or wards, to prevent the lock from opening unless the correct key is inserted. The correct key has notches or slots corresponding to ...

7. 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.