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Packhorse
A packhorse, pack horse, or sumpter refers to a horse, mule, donkey, or pony used to carry goods on its back, usually in sidebags or panniers. Typically packhorses are used to cross difficult terrain, where the absence of roads prevents the use of wheeled vehicles. Use of packhorses dates from the neolithic period to the present day. Today, westernized nations primarily use packhorses for recreational pursuits, but they are still an important part of everyday transportation of goods throughout much of the developing world and have some military uses in rugged regions. History Packhorses have been used since the earliest period of domestication of the horse. They were invaluable throughout antiquity, through the Middle Ages, and into modern times where roads are nonexistent or poorly maintained. Historic use in England Packhorses were heavily used to transport goods and minerals in England from medieval times until the construction of the first turnpike roads and canals in the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Packhorse Bridge
A packhorse bridge is a bridge intended to carry packhorses (horses loaded with sidebags or panniers) across a river or stream. Typically a packhorse bridge consists of one or more narrow (one horse wide) masonry arches, and has low Parapet#Bridge parapets, parapets so as not to interfere with the panniers borne by the horses. Multi-arched examples sometimes have triangular Starling (structure), cutwaters that are extended upward to form pedestrian refuges. Packhorse bridges were often built on the trade routes (often called packhorse routes) that formed major transport arteries across Europe and Great Britain until the coming of the toll road, turnpike roads and canals in the 18th century. Before the road-building efforts of Napoleon, all Principal passes of the Alps, crossings of the Alps were on packhorse trails. Travellers' carriages were dismantled and transported over the mountain passes by ponies and mule, mule trains. Definition In the British Isles at least, the definitio ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pannier
A pannier is a basket, bag, box, or similar container, carried in pairs either slung over the back of a beast of burden, or attached to the sides of a bicycle or motorcycle. The term derives from a Middle English borrowing of the Old French ''panier'', meaning 'bread basket'. Animal panniers Traditional panniers for animal transport are typically made of canvas, leather, or wicker. Modern panniers may be rectangular boxes of hard-sided plastic. Panniers are loaded in such a manner as to distribute weight evenly on either side of the animal. For horse packing, and when carrying particularly heavy loads on other animals they are supported by a pack saddle to distribute weight more evenly across the back of the animal. In some cases, additional items are placed on the back of the animal, between the panniers. Bicycle panniers There are many styles of bicycle panniers. Touring panniers are usually sold in pairs, intended to hold enough equipment for self-sustained tours over ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Marsden, West Yorkshire
Marsden is a large village in the Metropolitan Borough of Kirklees, West Yorkshire, England. It is in the South Pennines close to the Peak District which lies to the south. The village is west of Huddersfield at the confluence of the River Colne and Wessenden Brook. It was an important centre for the production of woollen cloth. In 2020, the village had an estimated population of 3,768. History Marsden grew wealthy in the 19th century from the production of woollen cloth. It is still home to Bank Bottom Mill, later known as Marsden Mill, and home to John Edward Crowther Ltd, formerly one of the largest mills in Yorkshire. The Crowthers moved to Marsden in 1876, beginning a long and profitable association with cloth manufacturing in the town. During the 1930s Bank Bottom Mill covered an area of 14 acres, employed 680 looms, and provided employment for 1,900 workers. [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pack Horse
Pack or packs may refer to: Places * Pack, Austria, a municipality in Styria, Austria * Pack, Missouri * Chefornak Airport, Alaska, by ICAO airport code Groups of animals or people * Pack (canine), family structure of wild animals of the biological family Canidae * Cub scouts group, or a group or gang in a larger sense, as in ''Leader of the Pack'' * Pack hunter, other animals that hunt in a group * Peloton (French for "platoon"), in road bicycle race, the main group or pack of riders Containment, packaging, and shipping * Pack, a deck of playing cards * Backpack * Cigarette pack * Pack animal or beast of burden, an individual or type of working animal used by humans as means of transporting materials Other uses * Pack (surname) * Pack (aircraft), P.A.C.K (Pneumatic Air Cycle Kit), a kit containing an air cycle machine that provides air conditioning as part of an aircraft's environmental control system * Pack (compression), a UNIX utility to compress files using Huffma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Galloway Pony
The Galloway pony is an extinct horse breed, once native to Scotland and northern England. It was said to have "good looks, a wide, deep chest and a tendency to pace rather than trot." In the 18th century Galloways were bred in Swaledale, to haul lead ore. The breed was mentioned by Shakespeare as "Galloway nags" in Henry IV, Part 2. "Thrust him down stairs! know we not Galloway nags?" Pistol - Henry IV, Part 2 by William Shakespeare A survey in 1814 stated: The province of Galloway formerly possessed a breed of horses peculiar to itself, which were in high estimation for the saddle, being, though of a small size, exceedingly hardy and active. They were larger than the ponies of Wales, and the north of Scotland, and rose from twelve to fourteen hands in height. The soils of Galloway, in their unimproved state, are evidently adapted for rearing such a breed of horses; and in the moors and mountainous part of the country, a few of the native breed are still to be found. … Th ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lehigh River
The Lehigh River is a U.S. Geological Survey. National Hydrography Dataset high-resolution flowline dataThe National Map, accessed April 1, 2011 tributary of the Delaware River in eastern Pennsylvania. The river flows in a generally southward pattern from The Poconos in Northeastern Pennsylvania through Allentown and much of the Lehigh Valley before enjoining the Delaware River in Easton. Part of the Lehigh River and a number of its tributaries are designated Pennsylvania Scenic Rivers by the state's Department of Conservation and Natural Resources. The river's name "Lehigh" is an anglicisation of the Lenape name for the river, ''Lechewuekink'', which means "where there are forks". Both Lehigh County and Lehigh Valley are named for the river. According to an environmental report from a Pennsylvania nonprofit research center, the Lehigh River watershed is ranked second nationally in the volume of toxic substances released into it in 2020. The study mirrors a previous report b ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Summit Hill, Pennsylvania
Summit Hill is a borough (Pennsylvania), borough in Carbon County, Pennsylvania. It is part of Northeastern Pennsylvania. The population was 3,034 at the 2010 census. Summit Hill has a storied history as the western terminus of the United States' second operational railway, the Mauch Chunk Switchback Railway, and some of the earliest coal mining, coal mines developed in North America, where the Lehigh Coal & Navigation Company began mining in 1792, establishing the town initially as little more than a mining camp with stables and paddocks. History Anthracite, Anthracite coal was discovered on the ridgeline of Sharpe Mountain (now known as Pisgah Mountain) in 1791 by a hunter. News of the find led to the founding of the Lehigh Coal & Navigation Company, Lehigh Coal Mining Company, which in 1792 began exploring the area in earnest and buying up promising land. Coal was found in 1794 by Phillip Ginter [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Anthracite
Anthracite, also known as hard coal, and black coal, is a hard, compact variety of coal that has a submetallic luster. It has the highest carbon content, the fewest impurities, and the highest energy density of all types of coal and is the highest ranking of coals. Anthracite is the most metamorphosed type of coal (but still represents low-grade metamorphism), in which the carbon content is between 86% and 97%. The term is applied to those varieties of coal which do not give off tarry or other hydrocarbon vapours when heated below their point of ignition. Anthracite ignites with difficulty and burns with a short, blue, and smokeless flame. Anthracite is categorized into standard grade, which is used mainly in power generation, high grade (HG) and ultra high grade (UHG), the principal uses of which are in the metallurgy sector. Anthracite accounts for about 1% of global coal reserves, and is mined in only a few countries around the world. The Coal Region of northeastern Pen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lehigh Coal & Navigation Company
The Lehigh Coal & Navigation Company was a mining and transportation company headquartered in Mauch Chunk, Pennsylvania, now known as Jim Thorpe, Pennsylvania. The company operated from 1818 until its dissolution in 1964 and played an early and influential role in the rise of the American Industrial Revolution and early U.S. industrialization. The company ultimately encompassed source industries, transport, and manufacturing, making it the first vertically integrated U.S. company.Archer B. HulbertThe Paths of Inland Commerce, A Chronicle of Trail, Road, and Waterway, Vol. 21, The Chronicles of America Series. Editor: Allen Johnson (1921) Building on two predecessor companies incorporated in 1818,, 627 pages (pdf) founders Erskine Hazard and Josiah White entered the coal industry to serve customers seeking a steady supply of fuel for foundries and mills on the falls of the Schuylkill River. Its role in accelerating regional industrial development by taking on civil engineering ch ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cut Bank
A cut bank, also known as a river cliff or river-cut cliff, is the outside bank of a curve or meander in a water channel (stream), which is continually undergoing erosion.Essentials of Geology, 3rd Ed, Stephen Marshak Cut banks are found in abundance along mature or meandering streams, they are located on the ''outside'' of a stream bend, known as a meander, opposite the slip-off slope on the inside of the bend. They are shaped much like a small cliff, and are formed by the erosion of soil as the stream collides with the river bank. As opposed to a point bar, which is an area of deposition, a cut bank is an area of erosion. Typically, cut banks are steep and may be nearly vertical. Often, particularly during periods of high rainfall and higher-than average water levels, trees and poorly placed buildings can fall into the stream due to mass wasting events. Given enough time, the combination of erosion along cut banks and deposition along point bars can lead to the formation of a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gully
A gully is a landform created by running water, mass movement, or commonly a combination of both eroding sharply into soil or other relatively erodible material, typically on a hillside or in river floodplains or terraces. Gullies resemble large ditches or small valleys, but are metres to tens of metres in depth and width and are characterised by a distinct 'headscarp' or 'headwall' and progress by headward (i.e. upstream) erosion. Gullies are commonly related to intermittent or ephemeral water flow usually associated with localised intense or protracted rainfall events, or snowmelt. Gullies can be formed and accelerated by cultivation practices on hillslopes (often gentle gradient) in farmland, and they can develop rapidly in rangelands from existing natural erosion forms subject to vegetative cover removal and livestock activity. Etymology The earliest known usage of the term is from 1657. It originates from the French word ''goulet'', a diminutive form of ''goule'' which m ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Gradient
In vector calculus, the gradient of a scalar-valued differentiable function of several variables is the vector field (or vector-valued function) \nabla f whose value at a point p is the "direction and rate of fastest increase". If the gradient of a function is non-zero at a point , the direction of the gradient is the direction in which the function increases most quickly from , and the magnitude of the gradient is the rate of increase in that direction, the greatest absolute directional derivative. Further, a point where the gradient is the zero vector is known as a stationary point. The gradient thus plays a fundamental role in optimization theory, where it is used to maximize a function by gradient ascent. In coordinate-free terms, the gradient of a function f(\bf) may be defined by: :df=\nabla f \cdot d\bf where ''df'' is the total infinitesimal change in ''f'' for an infinitesimal displacement d\bf, and is seen to be maximal when d\bf is in the direction of the gradi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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