Various shots of a new type of canal lock - barge seen moving through the lock.
Top shot of a new type of canal lock. Intertitle reads: "It can transfer 500 tons of dock, barge, (and bargees!) from a high level to a low level canal (or vice versa) and abolishes the old locks. In goes the barge..." L/S of a barge moving into the lock. The lock mechanism is lowered.
C/U of the cogs which operate the lock and of the counterweights. The dock is moved and we see the water level dropping. M/S of the lock gate opening and the "Saucy Sal" moving forwards out of the lock.