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Abney Level
An Abney level and clinometer is an instrument used in surveying which consists of a fixed sighting tube, a movable spirit level that is connected to a pointing arm, and a protractor scale. An internal mirror allows the user to see the bubble in the level while sighting a distant target. It can be used as a hand-held instrument or mounted on a Jacob's staff for more precise measurement, and it is small enough to carry in a coat pocket.Smaller Instruments and Appliances: The Abney Level and ClinometerA Manual of the Principal Instruments used in American Engineering and Surveying W. & L. E. Gurley, Troy, NY, 1891; page 219. The Abney level is an easy to use, relatively inexpensive, and, when used correctly, an accurate surveying tool. Abney levels typically include scales graduated in measure degrees of arc, percent grade, and in topographic Abney levels, grade in feet per surveyor's chain, and chainage correction. The latter is the cosine of the angle, used to convert distan ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elliott Brothers (computer Company)
Elliott Brothers (London) Ltd was an early computer company of the 1950s–60s in the United Kingdom. It traced its descent from a firm of instrument makers founded by William Elliott (1780 or 1781-1853) in London around 1804. The research laboratories were originally set up in 1946 at Borehamwood and the first Elliott 152 computer appeared in 1950. In its day the company was very influential. The computer scientist Bobby Hersom was an employee from 1953-1954, and Sir Tony Hoare was an employee there from August 1960 to 1968. He wrote an ALGOL 60 compiler for the Elliott 803. He also worked on an operating system for the new Elliott 503 Mark II computer. The founder of the UK's first software house, Dina St Johnston, had her first programming job there from 1953–1958, and John Lansdown pioneered the use of computers as an aid to planning on an Elliott 803 computer in 1963. In 1966 the company established an integrated circuit design and manufacturing facility in Gle ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tree Height Measurement
:''This article outlines the basic procedures for measuring trees for scientific and champion tree purposes. It does not cover timber assessment for production purposes, which is focused on marketable wood volumes rather than overall tree size.'' Tree height is the vertical distance between the base of the tree and the tip of the highest branch on the tree, and is difficult to measure accurately. It is not the same as the length of the trunk. If a tree is leaning, the trunk length may be greater than the height of the tree. The base of the tree is where the projection of the pith (center) of the tree intersects the existing supporting surface upon which the tree is growing or where the seed sprouted. If the tree is growing on the side of a cliff, the base of the tree is at the point where the pith would intersect the cliff side. Roots extending down from that point would not add to the height of the tree. On a slope this base point is considered as halfway between the ground level a ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Level Staff
{{short description, Graduated rod used to measure differences between heights A level staff, also called levelling rod, is a graduated wooden or aluminium rod, used with a levelling instrument to determine the difference in height between points or heights of points above a vertical datum. Rod construction and materials Levelling rods can be one piece, but many are sectional and can be shortened for storage and transport or lengthened for use. Aluminum rods may be shortened by telescoping sections inside each other, while wooden rod sections can be attached to each other with sliding connections or slip joints, or hinged to fold when not in use. There are many types of rods, with names that identify the form of the graduations and other characteristics. Markings can be in imperial or metric units. Some rods are graduated on one side only while others are marked on both sides. If marked on both sides, the markings can be identical or can have imperial units on one side and metric ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Francis Galton
Sir Francis Galton, FRS FRAI (; 16 February 1822 – 17 January 1911), was an English Victorian era polymath: a statistician, sociologist, psychologist, anthropologist, tropical explorer, geographer, inventor, meteorologist, proto-geneticist, psychometrician and a proponent of social Darwinism, eugenics, and scientific racism. He was knighted in 1909. Galton produced over 340 papers and books. He also created the statistical concept of correlation and widely promoted regression toward the mean. He was the first to apply statistical methods to the study of human differences and inheritance of intelligence, and introduced the use of questionnaires and surveys for collecting data on human communities, which he needed for genealogical and biographical works and for his anthropometric studies. He was a pioneer of eugenics, coining the term itself in 1883, and also coined the phrase " nature versus nurture". His book ''Hereditary Genius'' (1869) was the first social sc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Richard Collinson
Admiral Sir Richard Collinson (7 November 1811 – 13 September 1883) was an English naval officer and explorer of the Northwest Passage. Early life He was born in Gateshead, Tyne and Wear, England, then part of County Durham. He joined the Royal Navy in 1823 at age twelve and rose in the ranks, becoming a lieutenant in 1835, commander in 1841, and captain in 1842. China Collinson was in command of the ''Lady Bentinck'', a vessel of 1800 tons burden and 520 horsepower, when it appeared with the ''Phlegethon'' off Chapoo in eastern China, causing a "sensation". On 1 April 1842, the British Plenipotentiary of Trade Henry Pottinger reported that Collinson, as commander of the ''Nemesis'' based in Chusan, had contributed to a successful skirmish with Chinese troops on the island of Taisam near Ningbo in February of that year. As commander of HMS ''Plover'', and with the aid of Lt Henry Kellett in HMS ''Starling'', he surveyed the China coast from 1842 to 1846, producing charts ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
George Back
Admiral Sir George Back (6 November 1796 – 23 June 1878) was a British Royal Navy officer, explorer of the Canadian Arctic, naturalist and artist. He was born in Stockport. Career As a boy, he went to sea as a volunteer in the frigate in 1808 and took part in the destruction of batteries on the Spanish coast. In the following year, he was involved in combat in the Bay of Biscay, until he was captured by the French. Back remained a prisoner at Verdun until the peace of early 1814; during this time he studied French and mathematics and practised his skills as an artist, which he later put to use in recording his travels through the Canadian Arctic. Following his release, Back served on and as a midshipman before volunteering to serve under John Franklin in his first expedition to the Arctic in 1818. Back also served under Franklin in his two overland expeditions to survey the northern coast of North America, first on the Coppermine expedition—when Back was respon ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Geographical Society
The Royal Geographical Society (with the Institute of British Geographers), often shortened to RGS, is a learned society and professional body for geography based in the United Kingdom. Founded in 1830 for the advancement of geographical sciences, the Society has 16,000 members, with its work reaching the public through publications, research groups and lectures. The Society was founded in 1830 under the name ''Geographical Society of London'' as an institution to promote the 'advancement of geographical science'. It later absorbed the older African Association, which had been founded by Sir Joseph Banks in 1788, as well as the Raleigh Club and the Palestine Association. In 1995 it merged with the Institute of British Geographers, a body for academic geographers, to officially become the Royal Geographical Society ''with IBG''. The society is governed by its Council, which is chaired by the Society's President, according to a set of statutes and standing orders. The members ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal School Of Military Engineering
The Royal School of Military Engineering (RSME) Group provides a wide range of training for the British Army and Defence. This includes; Combat Engineers, Carpenters, Chartered Engineers, Musicians, Band Masters, Sniffer Dogs, Veterinary Technicians, Ammunition Experts, Bomb Disposal Operators, and Counter Chemical Warfare experts, as well as Command and Leadership. History The Peninsular War (1808–14) revealed deficiencies in the training and knowledge of officers and men in the conduct of siege operations and bridging. During this war low ranking Royal Engineers officers carried out large scale operations. They had under their command working parties of two or three battalions of infantry, two or three thousand men, who knew nothing in the art of siegeworks. Royal Engineers officers had to demonstrate the simplest tasks to the soldiers often while under enemy fire. Several officers were lost and could not be replaced and a better system of training for siege operations was r ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Clinometer
An inclinometer or clinometer is an instrument used for measuring angles of slope, elevation, or depression of an object with respect to gravity's direction. It is also known as a ''tilt indicator'', ''tilt sensor'', ''tilt meter'', ''slope alert'', ''slope gauge'', ''gradient meter'', ''gradiometer'', ''level gauge'', ''level meter'', ''declinometer'', and ''pitch & roll indicator''. Clinometers measure both inclines and declines using three different units of measure: degrees, percentage points, and topos. The astrolabe is an example of an inclinometer that was used for celestial navigation and location of astronomical objects from ancient times to the Renaissance. A ''tilt sensor'' can measure the tilting in often two axes of a reference plane in two axes. In contrast, a full motion would use at least three axes and often additional sensors. One way to measure tilt angle with reference to the earth's ground plane, is to use an accelerometer. Typical applications can be f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William De Wiveleslie Abney
Sir William de Wiveleslie Abney (24 July 1843 – 3 December 1920) was an English astronomer, chemist, and photographer. Life and career Abney was born in Derby, England, the son of Rev. Edward Abney (1811–1892), vicar of St Alkmund's Church, Derby, and owner of the Firs Estate. William was educated at Rossall School, the Royal Military Academy, Woolwich, and joined the Royal Engineers in 1861, with whom he served in India for several years. Thereafter, and to further his knowledge in photography, he became a chemical assistant at the Chatham School of Military Engineering. Abney was a pioneer of several technical aspects of photography. His father had been an early photographic experimenter and friend of Richard Keene, an early Derby photographer. Keene became a close friend of William and his brother Charles Edward Abney (1850–1914). Both Abney sons subsequently became founder members of the Derby Photographic Society in June 1884. His endeavors in the chemistry of p ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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