Caisson (lock gate)
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A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to float it and allow
Ship caisson at Droogdok Jan Blanken at Hellevoetsluis
Graving docks at Birkenhead, closed by a variety of ship caissons and floating (sliding) caissons
The base of the caisson closing the graving dock where the SS Great Britain was constructed.
Derelict sliding caisson in Cardiff Docks. The caisson retracted into the recess beyond. It was worked by the cable winch in the foreground.
Lock (water navigation)
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A lock is a device used for raising and lowering boats, ships and other watercraft between stretches of water of different levels on river and canal waterways. The distinguishing feature of a lock is
Caisson (lock gate)
…A caisson is a form of lock gate. It consists of a large floating iron or steel box. This can be flooded to seat the caisson in the opening of the dock to close it, or pumped dry to…
Canal lock and lock-keeper's cottage on the Aylesbury Arm of the Grand Union Canal at Marsworth in Buckinghamshire, England
Lock on the River Neckar at Heidelberg in Germany
Three Gorges Dam lock near Yichang on the Yangtze river, China
Operation of a canal lock 1–3. Boat enters 'empty' lock 4. Bottom gates are closed, bottom paddles closed, top paddles opened, lock starts to fill 5. Lock is filling with water, lifting boat to the higher level