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Slieve Snaght
Slieve Snaght () is a mountain in the middle of the Inishowen peninsula of County Donegal, Ireland. It rises to a height of , making it the highest mountain in Inishowen, and is one of the northernmost mountains of Ireland. It should not be confused with the mountain of the same name in the nearby Derryveagh range. It includes the lesser summits of Slieve Main, Crocknamaddy and Damph. Naming The mountain is said to be so named because snow lies on its summit until late May. In ''Cath Maige Tuired'' ("The Battle of Moytura"), a tale from Irish mythology, Slieve Snaght is called one of the "twelve chief mountains" of Ireland. There is a tradition of pilgrimage to the top of Slieve Snaght at Lughnasa, and a holy well near the summit, called ''Tobar na Súl'' ("well of the eyes"), is said to cure blindness. History In 1825, the summit was one of those used as a base for mapping Ireland as part of the Ordnance Survey's Principal Triangulation. The surveyors, which included Thom ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
P600 (hill)
This is a list of P600 mountains in Britain and Ireland by height. A P600 is defined as a mountain with a topographic prominence above , regardless of elevation or any other merits (e.g. topographic isolation); this is a similar approach to that of the Marilyn, Simms, HuMP and TuMP British Isle mountain and hill classifications. By definition, P600s have a height above , the requirement to be called a "mountain" in the British Isles. The "P" terminology is an international classification, along with P1500 Ultras. P600 and "Majors" are used interchangeably. , there were 120 P600s in the British Isles: 81 in Scotland, 25 in Ireland, 8 in Wales, 4 in England, 1 in Northern Ireland, and 1 in the Isle of Man. The 120 P600s contained 54 of the 282 Scottish Munros, and 10 of the 34 Non-Scottish Munros (or Furths), all of which have prominences above , and are sometimes called the "Super-Majors". The list also contained the highest mountains in Scotland, Wales, Ireland, and Eng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Principal Triangulation Of Great Britain
The Principal Triangulation of Britain was the first high-precision triangulation survey of the whole of Great Britain (including Ireland), carried out between 1791 and 1853 under the auspices of the Board of Ordnance. The aim of the survey was to establish precise geographical coordinates of almost 300 significant landmarks which could be used as the fixed points of local topographic surveys from which maps could be drawn. In addition there was a purely scientific aim in providing precise data for geodetic calculations such as the determination of the length of meridian arcs and the figure of the Earth. Such a survey had been proposed by William Roy (1726–1790) on his completion of the Anglo-French Survey but it was only after his death that the Board of Ordnance initiated the trigonometric survey, motivated by military considerations in a time of a threatened French invasion. Most of the work was carried out under the direction of Isaac Dalby, William Mudge and Thomas Fr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mountains And Hills Of County Donegal
A mountain is an elevated portion of the Earth's crust, generally with steep sides that show significant exposed bedrock. Although definitions vary, a mountain may differ from a plateau in having a limited summit area, and is usually higher than a hill, typically rising at least 300 metres (1,000 feet) above the surrounding land. A few mountains are isolated summits, but most occur in mountain ranges. Mountains are formed through tectonic forces, erosion, or volcanism, which act on time scales of up to tens of millions of years. Once mountain building ceases, mountains are slowly leveled through the action of weathering, through slumping and other forms of mass wasting, as well as through erosion by rivers and glaciers. High elevations on mountains produce colder climates than at sea level at similar latitude. These colder climates strongly affect the ecosystems of mountains: different elevations have different plants and animals. Because of the less hospitable terrain and ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Hewitt Mountains In England, Wales And Ireland
This is a list of Hewitt mountains in England, Wales and Ireland by height. Hewitts are defined as "Hills in England, Wales and Ireland over two thousand" feet in height, the general requirement to be called a "mountain" in the British Isles, and with a prominence above ; a mix of imperial and metric thresholds. The Hewitt classification was suggested by Alan Dawson in his 1992 book, "The Relative Hills of Britain". Dawson originally called his Hewitts "Sweats", from "Summits - Wales and England Above Two thousand", before settling on the label Hewitt. In a series of three booklets edited by Dave Hewitt, the list of English Hewitts was published in 1997, and the list of Welsh Hewitts was also published in 1997, and the list of Irish Hewitts was published in 1998. Hewitts were designed to address one of the criticisms of the 1990 Nuttall classification, by requiring hills to have a relative height of , a threshold that the UIAA had set down in 1994 for an "independent" ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of Marilyns In The British Isles
This is a list of Marilyn hills and mountains in the United Kingdom, Isle of Man and Ireland by height. Marilyns are defined as peaks with a prominence of or more, regardless of height or any other merit (e.g. topographic isolation, as used in Munros). Thus, Marilyns can be mountains, with a height above , or relatively small hills. there were 2,011 recorded Marilyns. Definition The Marilyn classification was created by Alan Dawson in his 1992 book ''The Relative Hills of Britain''. The name Marilyn was coined by Dawson as a punning contrast to the ''Munro'' classification of Scottish mountains above , but which has no explicit prominence threshold, being homophonous with (Marilyn) '' Monroe''. The list of Marilyns was extended to Ireland by Clem Clements. Marilyn was the first of several subsequent British Isles classifications that rely solely on prominence, including the P600s, the HuMPs, and the TuMPs. Topographic prominence is a more difficult to estimate than t ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
List Of P600 Mountains In The British Isles
This is a list of P600 mountains in Britain and Ireland by height. A P600 is defined as a mountain with a topographic prominence above , regardless of elevation or any other merits (e.g. topographic isolation); this is a similar approach to that of the Marilyn, Simms, HuMP and TuMP British Isle mountain and hill classifications. By definition, P600s have a height above , the requirement to be called a "mountain" in the British Isles. The "P" terminology is an international classification, along with P1500 Ultras. P600 and "Majors" are used interchangeably. , there were 120 P600s in the British Isles: 81 in Scotland, 25 in Ireland, 8 in Wales, 4 in England, 1 in Northern Ireland, and 1 in the Isle of Man. The 120 P600s contained 54 of the 282 Scottish Munros, and 10 of the 34 Non-Scottish Munros (or Furths), all of which have prominences above , and are sometimes called the "Super-Majors". The list also contained the highest mountains in Scotland, Wales, Ireland, and Eng ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lists Of Mountains And Hills In The British Isles
The mountains and hills of the British Isles are categorised into various lists based on different combinations of elevation, prominence, and other criteria such as isolation. These lists are used for peak bagging, whereby hillwalkers attempt to reach all the summits on a given list, the oldest being the 282 Munros in Scotland, created in 1891. A height above 2,000 ft, or more latterly 610 m, is considered necessary to be classified as a mountain – as opposed to a hill – in the British Isles. With the exception of Munros, all the lists require a prominence above . A prominence of between (e.g. some Nuttalls and Vandeleur-Lynams), does not meet the International Climbing and Mountaineering Federation (UIAA) definition of an "independent peak", which is a threshold over . Most lists consider a prominence between as a "top" (e.g. many Hewitts and Simms). Marilyns, meanwhile, have a prominence above , with no additional height threshold. They range from small hills to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lists Of Mountains In Ireland
In these lists of mountains in Ireland, those within Northern Ireland, or on the Republic of Ireland – United Kingdom border, are marked with an asterisk, while the rest are within the Republic of Ireland. Where mountains are ranked by height, the definition of the topographical prominence used to classify the mountain (e.g. the change in elevation required between neighbouring mountains), is noted. In British definitions, a height of is required for a mountain, whereas in Ireland, a lower threshold of is sometimes advocated. The lowest minimum prominence threshold of any definition of an Irish mountain is (e.g. the Vandeleur-Lynam), however most definitions, including the International Climbing and Mountaineering Federation (UIAA) criteria, do not consider prominences below as being mountains (e.g. must at least be an Arderin or a Hewitt). Many British definitions consider a peak with a prominence below , as being a ''top'', and not a mountain (e.g. must be a Marilyn ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Divis
Divis (; ) is a hill and area of sprawling moorland north-west of Belfast in County Antrim, Northern Ireland. With a height of 1,568 ft (478 m), it is the highest of the Belfast Hills. It is joined with the neighbouring Black Mountain, and in the past they may have been seen as one. Divis transmitting station is on the summit. The mountain extends north to the Antrim Plateau and shares its geology; consisting of a basaltic cover underlain by limestone and lias clay. Only recently have the Divis area and its surrounding mountains been handed over to the National Trust; from 1953 to 2005, it was under the control of the Ministry of Defence. It was also used as a training area for the British Army. It might have been released earlier, but due to the period of unrest known as the Troubles, the British Government and military A military, also known collectively as armed forces, is a heavily armed, highly organized force primarily intended for warfare. It is typicall ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Frederick Colby
Thomas Frederick Colby FRS FRSE FGS FRGS (1 September 17849 October 1852), was a British major-general and director of the Ordnance Survey (OS). A Fellow of the Royal Astronomical Society and Royal Society, Colby was one of the leading geographers of his time. An officer in the Royal Engineers, Colby overcame the loss of one hand in a shooting accident to begin in 1802 a lifelong connection with the Ordnance Survey. His most important work was the Survey of Ireland. He began planning this enormous enterprise in 1824 and directed it until 1846, in which year the final maps made by the survey were almost ready for issue. He was the inventor of the "Colby Bar" (a compensation bar), an apparatus used in base-measurements. Early life He was the eldest child of Major Thomas Colby, Royal Marines (died 1813) and his wife, Cornelia Hadden, sister of James Murray Hadden. He was born at St. Margaret's-next-Rochester on 1 September 1784. Colby was brought up by his father's sisters at ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Limelight
Limelight (also known as Drummond light or calcium light)James R. Smith (2004). ''San Francisco's Lost Landmarks'', Quill Driver Books. is a type of stage lighting once used in theatres and music halls. An intense illumination is created when a flame fed by oxygen and hydrogen is directed at a cylinder of quicklime (calcium oxide), which can be heated to before melting. The light is produced by a combination of incandescence and candoluminescence. Although it has long since been replaced by electric lighting, the term has nonetheless survived, as someone in the public eye is still said to be "in the limelight". The actual lamps are called "limes", a term which has been transferred to electrical equivalents. History Discovery and invention The limelight effect was discovered in the 1820s by Goldsworthy Gurney, based on his work with the "oxy-hydrogen blowpipe", credit for which is normally given to Robert Hare. In 1825, a Scottish engineer, Thomas Drummond (1797–1840), ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Drummond
Captain Thomas Drummond (10 October 1797 – 15 April 1840), from Edinburgh was a Scottish army officer, civil engineer and senior public official. He used the Drummond light which was employed in the trigonometrical survey of Great Britain and Ireland. He is sometimes mistakenly given credit for the invention of limelight, at the expense of Sir Goldsworthy Gurney. It was Drummond, however, who realised its value in surveying. Early life Drummond was the second of three sons. Despite his father dying when he was young, he credited his mother with getting him through his education at Edinburgh High School and then on to be a Royal Engineer cadet at Woolwich Academy in 1813. He showed an early gift for mathematics. After Woolwich he was stationed in Edinburgh and was involved with public works. He was bored with this and had enrolled at Lincoln's Inn when he was recruited to use his trigonometry to help conduct a survey in the Highlands. This new work was done in the summer wi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
