History
Work commenced in 1790 and lasted 27 years before finally reaching the Shannon in 1817, at a total cost of £1,421,954 . The canal passes through Maynooth, Kilcock, Enfield, Mullingar and Ballymahon has a spur to Longford. The total length of the main navigation is 145 kilometres (90 mi), and the system has 46 locks. There is one main feeder (from Lough Owel), which enters the canal at Mullingar.
At the Dublin end, the canal reaches the Liffey through a wide sequence of dock and locks at Spencer Dock, with a final sea lock to manage access to the river and sea.
In 1843, while walking with his wife along the Royal Canal, Sir William Rowan Hamilton realised the formula for quaternions and carved his initial thoughts into a stone on the Brougham Bridge over the canal.
Read more about this topic: Royal Canal
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