The Chinese invented the canal lock in the 10th century..
Yes, a lock does allow a canal boat, or any boat light enough in the matter, to raise and lower on a canal.
The lower barriers of a canal lock are called ground paddles. These paddles help to let water in or out of the canal.
Gate is the name given to the lower barrier of a canal lock. A Canal lock is used to lower and raise the water to move boats along a waterway.
a seletion of a waterway.
The Saint Lawrence Seaway
A canal Hair Remote car lock (has a lock but no key) airlock