High Quality Content by WIKIPEDIA articles! The Patent slip or Marine Railway was invented by Scotsman Thomas Morton in 1818 as a cheaper alternative to a dry dock for ship repair. It consisted of an inclined plane, which extended well into the water and wooden cradle onto which a ship was floated. The ship was then attached to the cradle and hauled out of the water up the slip.In 1832, a House of Commons Select Committee under the chairmanship of the, Rt. Hon Sir George Cockburn, was convened to adjudicate on a petition by Thomas Morton to extend the duration of his patent.

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