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Automatische Übersetzung:
John Loudon McAdam (1756-1836). Scottish civil engineer and road-builder. He invented a road surface using a technique of draining and laying down roads made of succesive layers of small broken stones, which were compacted by traffic. In the background of the painting workmen laying down a road. Anonymous portrait. Oil on canvas, c. 1830. National Portrait Gallery. London, England, United Kingdom.