canal lock![click to hear](/images/speaker.jpg)
Structure with a lock-chamber that can be filled with water or emptied to raise or lower a ship from one water level to another.
lock filling and emptying opening ![click to hear](/images/speaker.jpg)
Holes through which the water flows in to fill the lock-chamber or out to empty it.
upper gate ![click to hear](/images/speaker.jpg)
Watertight door or pair of doors made of wood or metal that open when the water levels between the lock-chamber and the upper level are the same.
lock filling opening ![click to hear](/images/speaker.jpg)
Holes through which the water flows to fill the lock-chamber.
lock filling intake ![click to hear](/images/speaker.jpg)
Conduit with a sluice that opens to raise the water level in the lock-chamber.
ladder ![click to hear](/images/speaker.jpg)
Ladder fixed to the side wall for climbing up out of and down into the lock-chamber.
miter gate recess ![click to hear](/images/speaker.jpg)
Indentation in the side wall into which a gate fits when open.
lock filling and emptying system ![click to hear](/images/speaker.jpg)
System consisting of a conduit with sluices alongside the side wall and perpendicular conduits on the canal bed that together raise and lower the water level in the lock.
canal bed ![click to hear](/images/speaker.jpg)
Thick concrete base that makes up the lock’s foundation.
lock emptying system ![click to hear](/images/speaker.jpg)
Conduit that evacuates the water from the downstream side causing the water level in the lock-chamber to go down.
approach wall ![click to hear](/images/speaker.jpg)
Wall along the side wall that guides ships into the lock.
lower gate ![click to hear](/images/speaker.jpg)
Watertight door or pair of doors made of wood or metal that open when the water levels between the lock-chamber and the lower level are the same.
line hook ![click to hear](/images/speaker.jpg)
Piece of wood or metal attached to the side wall for securing the rope that holds a ship in place while it is in the lock-chamber.
side wall ![click to hear](/images/speaker.jpg)
Wall forming one side of the lock-chamber and supporting its doors.