Film: 4293

Canals + Waterways | 1940 | Sound | B/W

Synopsis:

Canal Locks with the Ovaltine livery boats, Hertfordshire. A very clear explanation of how a lock works but somewhat simple commentary as it was a film intended for schools.
View of boats on a river. View of a shallow stream then montage of shots of rivers getting wider and wider. Canals. Description of how canals are made. Transporting coal and other goods by canal, which is cheaper than road transport. Coal being unloaded from a canal boat. Diagram how canals can travel up hill. Diagram of how a lock works. Grand Union Canal in Hertfordshire. Two narrow boats go into a lock together. Detailed description about how a lock works. A man goes ahead of the narrow boats to prepare the locks. He opens the sluice and the water empties into the other lock. There is room for two narrow boats in the lock at the same time. Man closes the lock. The lock fills with water and the boats are raised seven feet by 56 gallons of water. The lock takes two minutes to fill. Reservoirs are needed to keep enough water in the canal system, two men sit by one , possibly near Tring. Sometimes water can be pumped from wells or can be used from lakes. View of boats going through locks. Locks are also used on rivers. View of a river with a weir, the weir makes the water deep enough for boats, but a lock is needed to get past the weir.


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