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| {{Use British English|date=October 2012}} | |||
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| {{Other people|John McAdam}} | {{Other people|John McAdam}} | ||
| {{More footnotes|date=March 2010}} | {{More footnotes|date=March 2010}} | ||
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| |nationality = ] | |nationality = ] | ||
| |birth_date = 21 September 1756 | |birth_date = 21 September 1756 | ||
| |birth_place = ], |
|birth_place = ], Scotland | ||
| |death_date = {{death date and age|1836|11|26|1756|9|21|df=y}} | |death_date = {{death date and age|1836|11|26|1756|9|21|df=y}} | ||
| |death_place = ], ], Scotland | |death_place = ], ], Scotland | ||
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| |significant_awards = | |significant_awards = | ||
| }} | }} | ||
| '''John Loudon McAdam''' (21 September 1756 – 26 November 1836) was a ] |
'''John Loudon McAdam''' (21 September 1756 – 26 November 1836) was a ] engineer and road-builder. He invented a new process, "]isation", for building roads with a smooth hard surface that would be more durable and less muddy than ]-based tracks. | ||
| Modern road construction still reflects McAdam's influence. Of subsequent improvements, the most significant was the introduction of ] (originally ]) to bind the road surface's stones together |
Modern road construction still reflects McAdam's influence. Of subsequent improvements, the most significant was the introduction of ] (originally ]) to bind the road surface's stones together – "]" (for Tar Macadam) – followed later by the use of hot-laid tarred ] or tar-sprayed chippings to create better ]. More recently, ]-based ] laid on ] has become a major road surface, but its use of granite or ] chippings still recalls McAdam's innovation. | ||
| ==Early life== | ==Early life== | ||
| McAdam was born in ], |
McAdam was born in ], Scotland.<ref name=odnb>{{cite book|last=Buchanan|first=Brenda J.|title=]|publisher=Oxford University Press|location=Oxford, England|date=May 2007|chapter=McAdam, John Loudon }}</ref> He was the youngest of ten children and second son of the Baron of Waterhead. The family name had traditionally been McGregor, but was changed to McAdam (claiming descent from the Biblical ]) for political reasons in ]'s reign.<ref>{{cite book | ||
| | last =Lay | | last =Lay | ||
| | first =M G | | first =M G | ||
| Line 38: | Line 40: | ||
| | location =Sydney | | location =Sydney | ||
| | pages =401 | | pages =401 | ||
| | isbn = 1-875368-05-1 }} pp. |
| isbn = 1-875368-05-1 }} pp. 74–75</ref> He moved to New York in 1770 and, as a ] and ] during the ], made his fortune working at his uncle's ]. He returned to Scotland in 1783 and purchased an ] at Sauchrie, ]. | ||
| ==Road builder== | ==Road builder== | ||
| 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 ], England and he became general surveyor for the Bristol Corporation in 1804. He put forward his ideas in evidence to ] enquiries in 1810, 1819 and 1823.<ref>Ley (1992), p. 77</ref> In two ]s 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 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 ], England and he became general surveyor for the Bristol Corporation in 1804. He put forward his ideas in evidence to ] enquiries in 1810, 1819 and 1823.<ref>Ley (1992), p. 77</ref> In two ]s 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 ] to the Bristol ] in 1816, where he decided to remake the roads under his care with crushed ] bound with gravel on a firm base of large stones.<ref>A. W. Skempton (2002). ''A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: |
McAdam had also been appointed ] to the Bristol ] in 1816, where he decided to remake the roads under his care with crushed ] bound with gravel on a firm base of large stones.<ref>A. W. Skempton (2002). ''A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830''. p.416. Thomas Telford, 2002 </ref> A ], 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 ] times, became known as "macadamisation", or, more simply, "]". | ||
| <!--This material covered by ] article?: When a macadam road was built, side ditches were dug, and the road bed was laid with three layers of decreasingly-sized rocks, carefully |
<!--This material covered by ] article?: When a macadam road was built, side ditches were dug, and the road bed was laid with three layers of decreasingly-sized rocks, carefully pulverised "so as not to exceed 6 ounces in weight or to pass a two-inch ring." The finished road was compacted with a ] roller, and the compaction process was completed by passing traffic.--> | ||
| The macadam method spread very quickly across the world. The first macadam road in |
The macadam method spread very quickly across the world. The first macadam road in North America, the ], 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.{{Citation needed|date=September 2009}} | ||
| 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 ] to £2,000 in 1827.{{Citation needed|date=September 2009}} His efficient road-building and management work had revealed the corruption and abuse of ]s by unscrupulous Turnpike Trusts, many of which were run at a deliberate loss despite high toll receipts. | 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 ] to £2,000 in 1827.{{Citation needed|date=September 2009}} His efficient road-building and management work had revealed the corruption and abuse of ]s by unscrupulous Turnpike Trusts, many of which were run at a deliberate loss despite high toll receipts. | ||
| == Death and descendants == | == Death and descendants == | ||
| McAdam died in ], ], while returning to his home in ], |
McAdam died in ], ], while returning to his home in ], 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 ] around the country. His second surviving son, ], the "Colossus of Roads", was ] for managing turnpike trusts—a knighthood, it is said, previously offered to his father but declined.<ref name="odnb"/> | ||
| ==Notes== | ==Notes== | ||
| Line 68: | Line 70: | ||
| |NAME=McAdam, John Loudon | |NAME=McAdam, John Loudon | ||
| |ALTERNATIVE NAMES= | |ALTERNATIVE NAMES= | ||
| |SHORT DESCRIPTION=] |
|SHORT DESCRIPTION=] engineer and road-builder | ||
| |DATE OF BIRTH=21 September 1756 | |DATE OF BIRTH=21 September 1756 | ||
| |PLACE OF BIRTH=], |
|PLACE OF BIRTH=], Scotland | ||
| |DATE OF DEATH=26 November 1836 | |DATE OF DEATH=26 November 1836 | ||
| |PLACE OF DEATH=], ], Scotland | |PLACE OF DEATH=], ], Scotland | ||
Revision as of 06:50, 15 October 2012
For other people named John McAdam, see John McAdam (disambiguation).
 | This article includes a list of general references, but it lacks sufficient corresponding inline citations. Please help to improve this article by introducing more precise citations. (March 2010) (Learn how and when to remove this message) |
| John Loudon McAdam | |
|---|---|
 | |
| Born | 21 September 1756 Ayr, Scotland |
| Died | 26 November 1836(1836-11-26) (aged 80) Moffat, Dumfriesshire, Scotland |
| Nationality | Scottish |
| Occupation | Engineer |
| Engineering career | |
| Significant advance | "macadamisation" |
John Loudon McAdam (21 September 1756 – 26 November 1836) was a Scottish engineer and road-builder. He invented a new process, "macadamisation", for building roads with a smooth hard surface 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) – followed later by the use of hot-laid tarred aggregate or tar-sprayed chippings to create better road metalling. More recently, oil-based asphalt laid on reinforced concrete has become a major road surface, but its use of granite or limestone chippings still recalls McAdam's innovation.
Early life
McAdam was born in Ayr, Scotland. He was the youngest of ten children and second son of the Baron of Waterhead. The family name had traditionally been McGregor, but was changed to McAdam (claiming descent from the Biblical Adam) for political reasons in James I'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's counting house. He returned to Scotland in 1783 and purchased an estate at Sauchrie, Ayrshire.
Road builder
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 Nicholl MacAdam, the "Colossus of Roads", was knighted for managing turnpike trusts—a knighthood, it is said, previously offered to his father but declined.
Notes
- ^ Buchanan, Brenda J. (May 2007). "McAdam, John Loudon". Oxford Dictionary of National Biography. Oxford, England: Oxford University Press.
- Lay, M G (1992). Ways of the World. Sydney: Primavera Press. p. 401. ISBN 1-875368-05-1. pp. 74–75
- Ley (1992), p. 77
- A. W. Skempton (2002). A Biographical Dictionary of Civil Engineers in Great Britain and Ireland: 1500–1830. p.416. Thomas Telford, 2002
References
- Devereux, Roy (1936). John Loudon McAdam: Chapters in the History of Highways. London: Oxford University Press.
External links
- Remarks on the Present System of Road Making by John Loudon McAdam, 1821, from Google Book Search