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The boat enters the lock. 8–9. The boat enters the lock. 3. The lower gates are closed. 10. The upper gates are closed. 4–5. The lock is filled with water from upstream. 11–12. The lock is emptied by draining its water downstream. 6. The upper gates are opened. 13. The lower gates are opened. 7. The boat exits the lock. 14. The boat exits ...
[2] [3] The locks also have an overflow 'by-wash' at the side, which water runs down when the lock is not open. When a descending boat enters each lock chamber the water level rises slightly and the excess flows via an overflow channel at the side which runs into the main by-wash. [4] The structure is Grade I listed. [5]
While one source states that it takes about 10 minutes for a boat to lock through, [2] experiments done in the 1830s show that it was possible for a boat to go through in 3 minutes on average and as fast as 2 + 1 ⁄ 2 minutes, [3] while in 1897, it was shown that steamboats took 5 or 7 minutes to lock through going upstream or downstream ...
The caisson lock is a type of canal lock in which a narrowboat is floated into a sealed watertight box and raised or lowered between two different canal water levels. It was invented in the late 18th century as a solution to the problem posed by the excessive demand for water when conventional locks were used to raise and lower canal boats ...
The locomotives ascend the slope, pushing the water wedge in front of the lower gate. When the water level in the wedge matches that of the upper canal, the upper gate is opened and the boat is allowed to float free. To descend the process is reversed.
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The lock allowed boats to pass the weir while still allowing the mill to operate when the gate was closed. However it could take up to a day or even more to restore the water levels after a boat had passed, so their use was unpopular with the millers. Capstan Wheel near Hurley, England that was used to winch boats upstream past a flash lock. It ...
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