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A set of lock gear to empty or fill the chamber as required. This is usually a simple valve (traditionally, a flat panel (paddle) lifted by manually winding a rack and pinion mechanism) which allows water to drain into or out of the chamber. [11] Larger locks may use pumps. [12] The principle of operating a lock is simple.
Padlocks with modular locking mechanisms can often be taken apart to change the tumblers or to service the lock. Modular locking mechanism cylinders frequently employ pin, wafer, and disc tumblers. Padlocks with modular mechanisms are usually automatic, or self-locking (that is, the key is not required to lock the padlock)
Opening paddle valves on Lock 20. The Locks on the Chesapeake and Ohio Canal, located in Maryland, West Virginia, and Washington, D.C. of the United States, were of three types: lift locks; river locks; and guard, or inlet, locks. They were numbered 1 to 75, including two locks with fractional numbers (63 + 1 ⁄ 3 and 64 + 2 ⁄ 3) and none ...
A love lock or love padlock is a padlock that couples lock to a bridge, fence, gate, monument, or similar public fixture to symbolize their love. [2] Typically the sweethearts' names or initials, and perhaps the date, are inscribed on the padlock, and its key is thrown away (often into a nearby river) to symbolize unbreakable love.
Paddle and Rymer weir on the Thames Paddles stored for use at Northmoor Lock. The weirs which are the remnants of flash locks can still be seen on the River Thames though they are not used any more for navigation as regular pound locks were introduced in the eighteenth and nineteenth centuries and the last flash lock removed in 1937.
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 ...