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John Loudon McAdam (23 September 1756 – 26 November 1836) was a Scottish civil engineer and road-builder. He invented a new process, "macadamisation", for building roads with a smooth hard surface, using controlled materials of mixed particle size and predetermined structure, that would be more durable and less muddy than soil-based tracks.
Modern road construction still reflects McAdam's influence. Of subsequent improvements, the most significant was the introduction of tar (originally coal tar) to bind the road surface's stones together, "tarmac" (for Tar Macadam.)
Early life
McAdam was born in Ayr, Scotland. He was the youngest of ten children and second son of the Baron of Waterhead. He moved to Lagwine at Carsphairn when still a child to live with his grandparents. The family name was traditionally McGregor, but was changed to McAdam (claiming descent from the Biblical Adam) for political reasons in James VI's reign.
He moved to New York in 1770 and, as a merchant and prize agent during the American Revolution, made his fortune working at his uncle William McAdam's counting house. He returned to Scotland in 1783 and purchased an estate at Sauchrie, Ayrshire.
Besides taking part in local Ayrshire affairs, McAdam operated the Kaims Colliery. The colliery supplied coal to the British Tar Company, of Archibald Cochrane, 9th Earl of Dundonald, and partners in the coal tar trade; McAdam ran its kilns. He further was involved in the ironworks at Muirkirk, which was a customer for the coke byproduct of the tar business. This business connection is the only direct relationship of McAdam and tar.
Career
McAdam became a trustee of the Ayrshire Turnpike in 1783 and became increasingly involved with day-to-day road construction over the next 10 years. In 1802 he moved to Bristol, England and he became general surveyor for the Bristol Corporation in 1804. He put forward his ideas in evidence to Parliamentary enquiries in 1810, 1819 and 1823. In two treatises written in 1816 and 1819 (Remarks on the Present System of Road-Making and Practical Essay on the Scientific Repair and Preservation of Roads) he argued that roads needed to be raised above the surrounding ground and constructed from layered rocks and gravel in a systematic manner.
McAdam had also been appointed surveyor to the Bristol Turnpike Trust in 1816, where he decided to remake the roads under his care with crushed stone bound with gravel on a firm base of large stones. A camber, making the road slightly convex, ensured rainwater rapidly drained off the road rather than penetrate and damage the road's foundations. This construction method, the greatest advance in road construction since Roman times, became known as "macadamisation", or, more simply, "macadam".
The macadam method spread very quickly across the world. The first macadam road in North America, the National Road, was completed in the 1830s and most of the main roads in Europe were subject to the McAdam process by the end of the nineteenth century.
Although McAdam was paid £5,000 for his Bristol Turnpike Trust work and made "Surveyor-General of Metropolitan Roads" in 1820, professional jealousy cut a £5,000 grant for expenses from the Parliament of the United Kingdom to £2,000 in 1827. His efficient road-building and management work had revealed the corruption and abuse of road tolls by unscrupulous turnpike trusts, many of which were run at a deliberate loss despite high toll receipts.
Death and descendants
McAdam died in Moffat, Dumfriesshire, while returning to his home in Hoddesdon, Hertfordshire, from his annual summer visit to Scotland. His three sons, and in turn four grandsons, followed him into the profession and assisted with the management of turnpike trusts around the country. His second surviving son, James Nicoll McAdam, the "Colossus of Roads", was knighted for managing turnpike trusts: a knighthood, it is said, previously offered to his father but declined.
References
External links
Media related to John Loudon McAdam at Wikimedia Commons
Works related to John Loudon McAdam at Wikisource
Works by John Loudon McAdam at Open Library
Remarks on the Present System of Road Making by John Loudon McAdam, 1821, from Google Book Search
Magazine from the Department of Public Works in Puerto Rico indicating, with a map, about a firm called McAdams that built many highways in Puerto Rico
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John Loudon McAdam (23 September 1756 [1] – 26 November 1836) was a Scottish civil engineer and road-builder. He invented a new process, "macadamisation", for building roads with a smooth hard surface, using controlled materials of mixed particle size and predetermined structure, that would be more durable and less muddy than soil -based tracks.
John Loudon McAdam (born Sept. 21, 1756, Ayr, Ayrshire, Scot.—died Nov. 26, 1836, Moffat, Dumfriesshire) was a Scottish inventor of the macadam road surface. In 1770 he went to New York City, entering the countinghouse of a merchant uncle; he returned to Scotland with a considerable fortune in 1783. There he purchased an estate at Sauhrie ...
John Loudon McAdam was a pioneering Scottish engineer who almost single-handedly changed the way roads were built around the world. His innovative shallow camber, crushed, compacted stone...
06 Feb 2019 · John Loudon McAdam was a Scottish engineer who modernized the way we build roads. McAdam was born in Scotland in 1756 but moved to New York in 1790 to make his fortune.
John Loudon McAdam lived from 21 September 1756 to 26 November 1836. A member of a minor branch of Ayrshire nobility, he made his fortune in the United States before returning to Scotland and developing an interest in road construction.
McAdam's name became synonymous with the process of roadway construction, and his robust, cost-effective road designs complimented the canal systems developed throughout the British Isles during the industrial revolution. John Loudon McAdam was born in Ayshire, Scotland, on September 21, 1756.
31 Agu 2022 · John Loudon McAdam is hardly a household name but he should be, because he almost single-handedly changed the way roads were built around the world. The man who made the biggest contribution to highway construction since …
