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Sir Howard Grubb, Parsons And Co. Ltd.
Grubb Parsons (legally 'Sir Howard Grubb, Parsons and Co. Ltd.') was a historic manufacturer of telescopes, active in the 19th and 20th centuries. They built numerous large research telescopes, including several that were (at the time of construction) the largest in the world of their type. It was founded in 1833 by Thomas Grubb as the Grubb Telescope Company, located in Dublin. Control of the company passed to his son Howard Grubb in the 1860s. They produced dozens of telescopes, including some of the largest of the 19th century, such as the Great Melbourne Telescope (a reflecting telescope) in 1868, a refractor for the Vienna Observatory in 1878, and the Greenwich 28 inch refractor in 1893. Leading up to and during the First World War (1914-18) the company produced periscopes for submarines and moved to St Albans in 1918. In 1925 the company was purchased by Charles Algernon Parsons, renamed Grubb Parsons, and moved to Newcastle upon Tyne. In the 20th century they produced l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Great Melbourne Telescope
The Great Melbourne Telescope was built by the Grubb Telescope Company in Dublin, Ireland in 1868, and installed at the Melbourne Observatory in Melbourne, Australia in 1869. In 1945 that Observatory closed and the telescope was sold and moved to the Mount Stromlo Observatory near Canberra. It was rebuilt in the late 1950s. In 2003 the telescope, still in use as an observatory, was severely damaged in a bushfire. About 70% of the components were salvageable; a project to restore the telescope to working condition started in 2013. With a 48 inch (1.2 metre) diameter primary mirror, it was one of the largest telescopes of the late 19th century. This is a significant size even into the 21st century, although the lower reflecting ability of speculum metal mirrors (about 2/3 reflected) makes them inferior to later metal-on-glass designs or large refractors. This was significantly larger than the largest refractors of the period such as the James Lick telescope, Lick telescope and Yerkes ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Newcastle Upon Tyne
Newcastle upon Tyne, or simply Newcastle ( , Received Pronunciation, RP: ), is a City status in the United Kingdom, cathedral city and metropolitan borough in Tyne and Wear, England. It is England's northernmost metropolitan borough, located on the River Tyne's northern bank opposite Gateshead to the south. It is the most populous settlement in the Tyneside conurbation and North East England. Newcastle developed around a Roman Empire, Roman settlement called Pons Aelius. The settlement became known as ''Monkchester'' before taking on the name of The Castle, Newcastle, a castle built in 1080 by William the Conqueror's eldest son, Robert Curthose. It was one of the world's largest ship building and repair centres during the Industrial Revolution. Newcastle was historically part of the county of Northumberland, but governed as a county corporate after 1400. In 1974, Newcastle became part of the newly-created metropolitan county of Tyne and Wear. The local authority is Newcastle Ci ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Public Observatory
A public observatory is an astronomical observatory mainly dedicated to public and educational purposes. It is often supported by a municipality, a school or an astronomical society. The primary purpose of public observatories is to offer extensive programs for public education in astronomy. A second purpose may be to serve as a center for local hobby astronomers or for interested astro-tourists. Some sites are also engaged in special research programs (e.g., programs focused on meteors or asteroids). Public observatories are equipped with several optical telescopes that are housed within a dome or similar structure to protect the instruments from the elements. The domes have a slit in the roof that can be opened during observing and closed when the observatory is not in use. Additional equipment may include astronomical clocks, star maps, PCs, digital projectors, and educational material. See Also * List of observatories This is a partial list of astronomical observatori ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas Romney Robinson
John Thomas Romney Robinson (23 April 1792 – 28 February 1882), usually referred to as Thomas Romney Robinson, was an Irish astronomer. He was the director of the Armagh Observatory, one of the chief astronomical observatories in the UK of its time. He is remembered as inventor of the 4-cup anemometer. Biography Robinson was born at St Anne's in Dublin, the son of the English portrait painter Thomas Robinson (d. 1810) and his wife, Ruth Buck (d. 1826). He was educated at Belfast Academy then studied Divinity at Trinity College Dublin, where he was elected a Scholar in 1808, graduating BA in 1810 and obtaining a fellowship in 1814, at the age of 22. He was for some years a deputy professor of natural philosophy (physics) at Trinity. Having been also ordained as an Anglican priest while at Trinity, he obtained the church livings of the Anglican Church at Enniskillen and at Carrickmacross in 1824. In 1823, now aged 30, he additionally gained the appointment of astron ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Optics
Optics is the branch of physics that studies the behaviour and properties of light, including its interactions with matter and the construction of optical instruments, instruments that use or Photodetector, detect it. Optics usually describes the behaviour of visible light, visible, ultraviolet, and infrared light. Light is a type of electromagnetic radiation, and other forms of electromagnetic radiation such as X-rays, microwaves, and radio waves exhibit similar properties. Most optical phenomena can be accounted for by using the Classical electromagnetism, classical electromagnetic description of light, however complete electromagnetic descriptions of light are often difficult to apply in practice. Practical optics is usually done using simplified models. The most common of these, geometric optics, treats light as a collection of Ray (optics), rays that travel in straight lines and bend when they pass through or reflect from surfaces. Physical optics is a more comprehensive mo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Banknote
A banknote or bank notealso called a bill (North American English) or simply a noteis a type of paper money that is made and distributed ("issued") by a bank of issue, payable to the bearer on demand. Banknotes were originally issued by commercial banks, which were legally required to Redemption value, redeem the notes for legal tender (usually gold or silver coin) when presented to the chief cashier of the originating bank. These commercial banknotes only traded at face value in the market served by the issuing bank. Commercial banknotes have primarily been replaced by national banknotes issued by central banks or monetary authority, monetary authorities. By extension, the word "banknote" is sometimes used (including by collectors) to refer more generally to paper money, but in a strict sense notes that have not been issued by banks, e.g. government notes, are not banknotes. National banknotes are often, but not always, legal tender, meaning that courts of law are required to ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Printing Presses
A printing press is a mechanical device for applying pressure to an inked surface resting upon a print medium (such as paper or cloth), thereby transferring the ink. It marked a dramatic improvement on earlier printing methods in which the cloth, paper, or other medium was brushed or rubbed repeatedly to achieve the transfer of ink and accelerated the process. Typically used for texts, the invention and global spread of the printing press was one of the most influential events in the second millennium. In Germany, around 1440, the goldsmith Johannes Gutenberg invented the movable-type printing press, which started the Printing Revolution. Modelled on the design of existing screw presses, a single Renaissance movable-type printing press could produce up to 3,600 pages per workday, compared to forty by hand-printing and a few by hand-copying. Gutenberg's newly devised hand mould made possible the precise and rapid creation of metal movable type in large quantities. His ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Billiard Table
A billiard table or billiards table is a bounded table on which cue sports are played. In the modern era, all billiards tables (whether for carom billiards, Pool (cue sports), pool, Russian pyramid, pyramid or snooker) provide a flat surface usually made of quarried slate, that is covered with cloth (usually of a tightly woven worsted wool called baize), and surrounded by vulcanized rubber cushions, with the whole thing elevated above the floor. More specific terms are used for specific sports, such as snooker table and pool table, and different-sized billiard balls are used on these table types. An obsolete term is billiard board, used in the 16th and 17th centuries. Parts and equipment Cushions Cushions (also sometimes called "rail cushions", "cushion rubber", or rarely "bumpers") are located on the inner sides of a table's wooden . There are several different materials and design philosophies associated with cushion rubber. These cushions are made from an elastic material suc ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cast Iron
Cast iron is a class of iron–carbon alloys with a carbon content of more than 2% and silicon content around 1–3%. Its usefulness derives from its relatively low melting temperature. The alloying elements determine the form in which its carbon appears: Cast iron#White cast iron, white cast iron has its carbon combined into an iron carbide named cementite, which is very hard, but brittle, as it allows cracks to pass straight through; Grey iron, grey cast iron has graphite flakes which deflect a passing crack and initiate countless new cracks as the material breaks, and Ductile iron, ductile cast iron has spherical graphite "nodules" which stop the crack from further progressing. Carbon (C), ranging from 1.8 to 4 wt%, and silicon (Si), 1–3 wt%, are the main alloying elements of cast iron. Iron alloys with lower carbon content are known as steel. Cast iron tends to be brittle, except for malleable iron, malleable cast irons. With its relatively low melting point, g ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Precision Engineering
Precision engineering is a subdiscipline of electrical engineering, software engineering, electronics engineering, mechanical engineering, and optical engineering concerned with designing machines, fixtures, and other structures that have exceptionally low tolerances, are repeatable, and are stable over time. These approaches have applications in machine tools, MEMS, NEMS, optoelectronics design, and many other fields. Precision engineering is a branch of engineering that focus on the design, development and manufacture of product with high levels of accuracy and repeatability. It involves the use of advanced technologies and techniques to achieve tight tolerance and dimensional control in the manufacturing process. Overview Professors Hiromu Nakazawa and Pat McKeown provide the following list of goals for precision engineering: # Create a highly precise movement. # Reduce the dispersion of the product's or part's function. # Eliminate fitting and promote assembly, espec ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Description Of The Equatorial Mounting Of Mr
Description is any type of communication that aims to make vivid a place, object, person, group, or other physical entity. It is one of four rhetorical modes (also known as ''modes of discourse''), along with exposition, argumentation, and narration. Fiction writing Fiction writing specifically has modes such as action, exposition, description, dialogue, summary, and transition. Author Peter Selgin refers to ''methods'', including action, dialogue, thoughts, summary, scenes, and description. Description is the mode for transmitting a mental image of the particulars of a story. Together with dialogue, narration, exposition, and summarization, it is one of the most widely recognized of the fiction-writing modes. As stated in ''Writing from A to Z'', edited by Kirk Polking, it is more than the amassing of details; it is bringing something to life by carefully choosing and arranging words and phrases to produce the desired effect. Purple prose A purple patch is an over-written pas ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Herschel Telescope
The William Herschel Telescope (WHT) is a optical and near-infrared reflecting telescope located at the Roque de los Muchachos Observatory on the island of La Palma in the Canary Islands, Spain. The telescope, which is named after William Herschel, the discoverer of the planet Uranus, is part of the Isaac Newton Group of Telescopes. It is funded by research councils from the United Kingdom, the Netherlands and Spain. At the time of construction in 1987, the WHT was the third largest single optical telescope in the world.The BTA-6 (6.0 m) and Hale Telescope (5.1 m) were both larger; the Multiple Mirror Telescope also had a larger collecting area but did not have a single primary mirror It is currently the second largest in Europe,The neighbouring Gran Telescopio Canarias (10.4 m) overtook the WHT in 2009 to become the largest in Europe and was the last telescope constructed by Grubb Parsons in their 150-year history. The WHT is equipped with a wide range of i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
