13-647: Greenhill may refer to: People [ edit ] Greenhill (surname) Places [ edit ] In the UK Greenhill, Camden , London, England Greenhill, County Antrim , a townland in County Antrim , Northern Ireland Greenhill, County Durham , England Greenhill, County Fermanagh , a townland in County Fermanagh, Northern Ireland Greenhill, Dorset , England Greenhill,
26-694: A neighbourhood of Coatbridge , Scotland Greenhill, Dumfriesshire , Scotland Greenhill, Edinburgh , Scotland Greenhill, Evesham , Worcestershire, England, main location of the Battle of Evesham in 1265 Greenhill, Falkirk , Scotland Greenhill, Harrow , London, England Greenhill, Herefordshire England Greenhill, Kent , England Greenhill, Kidderminster , Worcestershire, England Greenhill, Lancashire , England Greenhill, Leicestershire , England Greenhill, Sheffield , England Greenhill, Swansea , Wales Elsewhere Greenhill, Nova Scotia , Canada Zielonagóra ( Greenhill ),
39-661: A specific person led you to this page, you may wish to change that link by adding the person's given name (s) to the link. Retrieved from " https://en.wikipedia.org/w/index.php?title=Greenhill_(surname)&oldid=1121700957 " Category : Surnames Hidden categories: Articles with short description Short description is different from Wikidata All set index articles Alfred George Greenhill Sir Alfred George Greenhill FRS FRAeS (29 November 1847 in London – 10 February 1927 in London),
52-841: A village in Greater Poland Voivodeship, Szamotuły County, Obrzycko commune, Poland Greenhill, South Australia , a suburb in Australia Greenhill Recreation Park , a protected area in South Australia Greenhill Ogham Stones , Republic of Ireland Businesses and institutions [ edit ] Greenhill & Co. , a New York-based investment bank Greenhill School (Addison, Texas) , Addison, Texas, United States Ysgol Greenhill School , Pembrokeshire, Wales, United Kingdom Titles [ edit ] Baron Greenhill (of Townhead in
65-1098: Is different from Wikidata All article disambiguation pages All disambiguation pages Greenhill (surname) Greenhill is a surname. Notable people with the surname include: Alfred George Greenhill (1847–1927), British mathematician Basil Greenhill (1920–2003), English diplomat, museum director and historian Catherine Greenhill , Australian mathematician Craig Greenhill (born 1972), Australian rugby league player David Greenhill (born 1985), Scottish footballer Denis Greenhill, Baron Greenhill of Harrow (1913–2000), British diplomat Elizabeth Greenhill (1615–1679), British mother of 39 children Elizabeth Greenhill (bookbinder) , (1907–2006), English bookbinder Ernest Greenhill, 1st Baron Greenhill (1887–1967), Scottish politician Gary Greenhill (born 1985), Scottish footballer Sir George Greenhill (1847–1927), English mathematician Henry Greenhill (1646–1708), British mariner and politician Joe R. Greenhill (1914–2011), American attorney, chief justice of
78-536: Is of acknowledged excellence. He was one of the world's leading experts on applications of elliptic integrals in electromagnetic theory. He was a Plenary Speaker of the ICM in 1904 at Heidelberg (where he also gave a section talk) and an Invited Speaker of the ICM in 1908 at Rome, in 1920 at Strasbourg, and in 1924 at Toronto. In 1879 Greenhill calculated complicated twist rate formulas for rifled artillery by approximating
91-525: The British East India Company Thomas Greenhill (surgeon) (1669–1740), British surgeon and author William Greenhill (1591–1671), English nonconformist clergyman and author William Alexander Greenhill (1814–1894), English physician, literary editor and sanitary reformer [REDACTED] Surname list This page lists people with the surname Greenhill . If an internal link intending to refer to
104-482: The City of Glasgow) Baron Greenhill of Harrow Greenhill-Russell Baronets See also [ edit ] Green Hill (disambiguation) Green Hills (disambiguation) Greenhills (disambiguation) Greensill , and Greensill Capital a UK-based steel conglomerate Grinnell (disambiguation) Topics referred to by the same term [REDACTED] This disambiguation page lists articles associated with
117-702: The Texas Supreme Court John Greenhill ( c. 1644 –1676), English portrait painter John Russell Greenhill ( c. 1730 –1813), English clergyman, owner of "Chequers" Joseph Greenhill (1704–1788), English clergyman and religious disputer Kelly M. Greenhill (born 1970), American political scientist Robert F. Greenhill (born 1936), American investment banker Sir Robert Greenhill-Russell, 1st Baronet (1763–1836), British Member of Parliament, owner of "Chequers" Thomas Greenhill (colonial administrator) (1611–1658), English colonial administrator, pioneer of
130-733: The projectile as an elongated ellipsoid of rotation in incompressible fluid (which, as he couldn't have known back then, assumes subsonic flight). Later, English ballistician F. W. Jones simplified it for typical bullet lengths into a rule of thumb for calculating the optimal twist rate for lead-core bullets. This shortcut uses the bullet's length, needing no allowances for weight or nose shape. The eponymous Greenhill formula , still used today, is: T w i s t = C D 2 L × S G 10.9 {\displaystyle \mathrm {Twist} ={\frac {CD^{2}}{L}}\times {\sqrt {\frac {SG}{10.9}}}} where: The original value of C
143-414: The title Greenhill . If an internal link led you here, you may wish to change the link to point directly to the intended article. Retrieved from " https://en.wikipedia.org/w/index.php?title=Greenhill&oldid=1022940897 " Categories : Disambiguation pages Place name disambiguation pages Educational institution disambiguation pages Hidden categories: Short description
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#1732772288830156-473: Was 150, which yields a twist rate in inches per turn, when given the diameter D and the length L of the bullet in inches. This works to velocities of about 840 m/s (2800 ft/s); above those velocities, a C of 180 should be used. For instance, with a velocity of 600 m/s (2000 ft/s), a diameter of 0.5 inches (13 mm) and a length of 1.5 inches (38 mm), the Greenhill formula would give
169-490: Was a British mathematician . George Greenhill was educated at Christ's Hospital School and from there he went to St John's College, Cambridge in 1866. In 1876, Greenhill was appointed professor of mathematics at the Royal Military Academy (RMA) at Woolwich , London, UK. He held this chair until his retirement in 1908, when he was knighted . His 1892 textbook on applications of elliptic functions
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