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
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
Canal of the Pharaohs
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The Canal of the Pharaohs, also called the Ancient Suez Canal or Necho's Canal or Darius Canal, is the forerunner of the Suez Canal, constructed in ancient times and kept in use, with intermissions, u
Lock (water navigation)
…time, more and larger locks have been used in canals to allow a more direct route to be taken. In ancient Egypt, river locks were probably part of the Canal of the Pharaohs. Engineers of Ptolemy II are credited by Diodorus Siculus with being the first to solve the problem of keeping the Nile free of salt water when they…
Remains of a large circular tower in the Babylon Fortress (present-day Old Cairo), built by Diocletian in the 3rd century AD to defend the Roman canal's entrance on the Nile
Suez Canal EO