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Macadam
Macadam is a type of road construction, pioneered by Scottish engineer John Loudon McAdam around 1820, in which crushed stone is placed in shallow, convex layers and compacted thoroughly. A binding layer of stone dust (crushed stone from the original material) may form; it may also, after rolling, be covered with a cement or bituminous binder to keep dust and stones together. The method simplified what had been considered state-of-the-art at that point. Predecessors Pierre-Marie-Jérôme Trésaguet Pierre-Marie-Jérôme Trésaguet is sometimes considered the first person to bring post-Roman science to road building. A Frenchman from an engineering family, he worked paving roads in Paris from 1757 to 1764. As chief engineer of road construction of Limoges, he had opportunity to develop a better and cheaper method of road construction. In 1775, Tresaguet became engineer-general and presented his answer for road improvement in France, which soon became standard practice there. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Macadam Road 1850s
Macadam is a type of road construction, pioneered by Scottish engineer John Loudon McAdam around 1820, in which crushed stone is placed in shallow, convex layers and compacted thoroughly. A binding layer of stone dust (crushed stone from the original material) may form; it may also, after rolling, be covered with a cement or bituminous binder to keep dust and stones together. The method simplified what had been considered state-of-the-art at that point. Predecessors Pierre-Marie-Jérôme Trésaguet Pierre-Marie-Jérôme Trésaguet is sometimes considered the first person to bring post-Roman science to road building. A Frenchman from an engineering family, he worked paving roads in Paris from 1757 to 1764. As chief engineer of road construction of Limoges, he had opportunity to develop a better and cheaper method of road construction. In 1775, Tresaguet became engineer-general and presented his answer for road improvement in France, which soon became standard practice there ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Loudon McAdam
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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Turnpike Trust
Turnpike trusts were bodies set up by individual Acts of Parliament in the United Kingdom, acts of Parliament, with powers to collect road toll road, tolls for maintaining the principal roads in Kingdom of Great Britain, Britain from the 17th but especially during the 18th and 19th centuries. At the peak, in the 1830s, over 1,000 trusts administered around of turnpike road in England and Wales, taking tolls at almost 8,000 toll-gates and side-bars. During the early 19th century the concept of the turnpike trust was adopted and adapted to manage roads within the British Empire (Ireland, Canada, Australia, New Zealand, India, and South Africa) and in the United States. Turnpikes declined with the Railway mania, coming of the railways and then the Local Government Act 1888 gave responsibility for maintaining main roads to county councils and county borough councils. Etymology The term "turnpike" originates from the similarity of the gate used to control access to the road, to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road Construction
A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of roads, including parkways, avenues, controlled-access highways (freeways, motorways, and expressways), tollways, interstates, highways, thoroughfares, and local roads. The primary features of roads include lanes, sidewalks (pavement), roadways (carriageways), medians, shoulders, verges, bike paths (cycle paths), and shared-use paths. Definitions Historically many roads were simply recognizable routes without any formal construction or some maintenance. The Organization for Economic Co-operation and Development (OECD) defines a road as "a line of communication (travelled way) using a stabilized base other than rails or air strips open to public traffic, primarily for the use of road motor vehicles running on their own wheels", which ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pierre-Marie-Jérôme Trésaguet
Pierre-Marie-Jérôme Trésaguet (15 January 1716 – 1796) was a French engineer. He is widely credited with establishing the first scientific approach to road building about the year 1764. Among his innovations was the use of a base layer of large stone covered with a thin layer of smaller stone. The advantage of this two-layer configuration was that when rammed or rolled by traffic the stones jammed into one another forming a strong wear resistant surface which offered less obstruction to traffic. Trésaguet was born in Nevers, the youngest son from a family of engineers. He began his career as a sub inspector in the Corps des Ponts et Chaussées (Bridges and Highways Corps), in Paris. He later moved to Limoges, Haute-Vienne as chief engineer in 1764. In 1775 he was appointed inspector general of roads and bridges for all of France. He published a paper describing his road building methods. Method of road building First of all an earth foundation was excavated parallel with ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Road
A road is a linear way for the conveyance of traffic that mostly has an improved surface for use by vehicles (motorized and non-motorized) and pedestrians. Unlike streets, the main function of roads is transportation. There are many types of roads, including parkways, avenues, controlled-access highways (freeways, motorways, and expressways), tollways, interstates, highways, thoroughfares, and local roads. The primary features of roads include lanes, sidewalks (pavement), roadways (carriageways), medians, shoulders, verges, bike paths (cycle paths), and shared-use paths. Definitions Historically many roads were simply recognizable routes without any formal construction or some maintenance. The Organization for Economic Co-operation and Development (OECD) defines a road as "a line of communication (travelled way) using a stabilized base other than rails or air strips open to public traffic, primarily for the use of road motor vehicles running on their own wheels", whic ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Scottish Lowlands
The Lowlands ( sco, Lallans or ; gd, a' Ghalldachd, , place of the foreigners, ) is a cultural and historical region of Scotland. Culturally, the Lowlands and the Highlands diverged from the Late Middle Ages into the modern period, when Lowland Scots replaced Scottish Gaelic throughout most of the Lowlands. Geography The Lowlands is not an official geographical or administrative area of the country. There are two main topographic regions: the Lowlands and the Southern Uplands. The term "Lowlands" mainly refers to the Central Lowlands. However, in normal usage it refers to those parts of Scotland not in the Highlands (or Gàidhealtachd). The boundary is usually considered to be a line between Stonehaven and Helensburgh (on the Firth of Clyde). The Lowlands lie south and east of the line. Note that some parts of the Lowlands (such as the Southern Uplands) are not physically "low," Merrick for example reaching , while some areas indisputably in the Highlands (such as Islay ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Bristol
Bristol () is a city, ceremonial county and unitary authority in England. Situated on the River Avon, it is bordered by the ceremonial counties of Gloucestershire to the north and Somerset to the south. Bristol is the most populous city in South West England. The wider Bristol Built-up Area is the eleventh most populous urban area in the United Kingdom. Iron Age hillforts and Roman villas were built near the confluence of the rivers Frome and Avon. Around the beginning of the 11th century, the settlement was known as (Old English: 'the place at the bridge'). Bristol received a royal charter in 1155 and was historically divided between Gloucestershire and Somerset until 1373 when it became a county corporate. From the 13th to the 18th century, Bristol was among the top three English cities, after London, in tax receipts. A major port, Bristol was a starting place for early voyages of exploration to the New World. On a ship out of Bristol in 1497, John Cabot, a Venetia ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surveyor-general
A surveyor general is an official responsible for government surveying in a specific country or territory. Historically, this would often have been a military appointment, but it is now more likely to be a civilian post. The following surveyor general positions exist, or have existed historically: *Surveyors general in Australia: ** Surveyor General of New South Wales ** Surveyor General of South Australia ** Surveyor General of Queensland ** Surveyor General of Tasmania ** Surveyor General of the Northern Territory ** Surveyor General of Victoria ** Surveyor General of Western Australia *Surveyors general in Canada: ** Arpenteur général du Québec - prior to 1840s as Surveyor General of Lower Canada ** Surveyor General of Ontario - 1791 to 1829 as Surveyor General of Upper Canada and the Commissioner of Crown Lands (Province of Canada) 1827 to 1867 ** Surveyor General of Nova Scotia *Surveyors-general in British North America ** Surveyor General of the Colony of Vancouver Isl ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Carriage
A carriage is a private four-wheeled vehicle for people and is most commonly horse-drawn. Second-hand private carriages were common public transport, the equivalent of modern cars used as taxis. Carriage suspensions are by leather strapping and, on those made in recent centuries, steel springs. Two-wheeled carriages are informal and usually owner-driven. Coaches are a special category within carriages. They are carriages with four corner posts and a fixed roof. Two-wheeled war chariots and transport vehicles such as four-wheeled wagons and two-wheeled carts were forerunners of carriages. In the twenty-first century, horse-drawn carriages are occasionally used for public parades by royalty and for traditional formal ceremonies. Simplified modern versions are made for tourist transport in warm countries and for those cities where tourists expect open horse-drawn carriages to be provided. Simple metal sporting versions are still made for the sport known as competitive driving. ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tyres
A tire (American English) or tyre (British English) is a ring-shaped component that surrounds a Rim (wheel), wheel's rim to transfer a vehicle's load from the axle through the wheel to the ground and to provide Traction (engineering), traction on the surface over which the wheel travels. Most tires, such as those for automobiles and bicycles, are pneumatically inflated structures, which also provide a flexible cushion that absorbs shock as the tire rolls over rough features on the surface. Tires provide a footprint, called a contact patch, that is designed to match the weight of the vehicle with the bearing strength of the surface that it rolls over by providing a bearing pressure that will not deform the surface excessively. The materials of modern pneumatic tires are synthetic rubber, natural rubber, fabric, and wire, along with carbon black and other chemical compounds. They consist of a tire tread, tread and a body. The tread provides Traction (engineering), traction ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
