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(Note that lock 6 had been converted to a drop gate, and later converted back to a V gate. [30]) With the mechanical locks, a lever pulls a rod which connects to a crank, connected to another rod which turned the wicket valve which was in the floor (below where the gate would rest when opened) and water flows below the floor and into the lock.
A plan and side view of a generic, empty canal lock. A lock chamber separated from the rest of the canal by an upper pair and a lower pair of mitre gates.The gates in each pair close against each other at an 18° angle to approximate an arch against the water pressure on the "upstream" side of the gates when the water level on the "downstream" side is lower.
The caisson may only need to be lifted a few inches to make it movable on its track, which significantly reduces the ballast pumping time compared to a ship caisson. When closing the gate, the track guides it automatically back into place, avoiding the slow manoeuvering with tugs or winches necessary to align a ship caisson.
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The arrow shaft broke leaving the arrow point buried six inches deep in his head. Court surgeon John Bradmore devised a special tool to extract the arrow point and saved the prince's life.
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