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a form of slavery. In 1812 David Brewster commissioned Bald to write the 'mine' entry for the 'Edinburg Encyclopaedia', a task that involved visiting the colliery at Killingworth where George Stephenson had introduced a steam-powered machine for raising coal from the pit face. In 1825 he and Stevenson drew up plans for the improvement of Alloa dock, which included the creation of a wet dock and swivel bridge.

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