Lock (water navigation)

Canal lock and lock-keeper's cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Hertfordshire, England

Lock on the River Neckar at Heidelberg in Germany

Three gorges dam lock near Yichang on Yangtze river, China

A pound lock on the Keitele-Päijänne Canal at Äänekoski in Central Finland

A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.

单词	Lock chamber
释义	Lock chamber 英语百科 Lock (water navigation) A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is a fixed chamber in which the water level can be varied; whereas in a caisson lock, a boat lift, or on a canal inclined plane, it is the chamber itself (usually then called a caisson) that rises and falls.
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Lock chamber

Lock (water navigation)