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Marching Line
Marching lines are a pair of lines drawn on the glass of a compass, and arranged at 45 degrees to each other. These are an essential component in hiking through the wilderness. Most modern compasses have adjustable luminous marching lines. See also * Azimuth * Beam compass * Circumferentor, or surveyor's compass * Coordinate system * Fluxgate compass * Gyrocompass * Inertial navigation system * Pelorus * Radio direction finder References Further reading * Amir Aczel, ''The Riddle of the Compass: The Invention that Changed the World'', * ''Admiralty manual of navigation'', Chapter XXV "The Magnetic Compass (continued) the analysis and correction of the deviation", His Majesty's Stationery Office, London, 1914. * Paul J. Gans"Compass"The Medieval Technology Pages * Frances and Joseph Gies, ''Cathedral, Forge, and Waterwheel'' subtitled "Technology and Invention in the Middle Ages". * Frederic Lane, "The Economic Meaning of the Invention of the Compass", ''American Historical ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
2016 Busola
Sixteen or 16 may refer to: *16 (number), the natural number following 15 and preceding 17 *one of the years 16 BC, AD 16, 1916, 2016 Films * ''Pathinaaru'' or ''Sixteen'', a 2010 Tamil film * Sixteen (1943 film), ''Sixteen'' (1943 film), a 1943 Argentine film directed by Carlos Hugo Christensen * Sixteen (2013 Indian film), ''Sixteen'' (2013 Indian film), a 2013 Hindi film * Sixteen (2013 British film), ''Sixteen'' (2013 British film), a 2013 British film by director Rob Brown Music *The Sixteen, an English choir *16 (band), a sludge metal band *Sixteen (Polish band), a Polish band Albums *16 (Robin album), ''16'' (Robin album), a 2014 album by Robin * 16 (Madhouse album), a 1987 album by Madhouse *Sixteen (album), ''Sixteen'' (album), a 1983 album by Stacy Lattisaw *''Sixteen'' , a 2005 album by Shook Ones (band), Shook Ones * ''16'', a 2020 album by Wejdene Songs *16 (Sneaky Sound System song), "16" (Sneaky Sound System song), 2009 *Sixteen (Thomas Rhett song), "Sixteen" ( ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Pelorus (instrument)
In marine navigation, a pelorus is a reference tool for maintaining bearing of a vessel at sea. It is a "simplified compass" without a directive element, suitably mounted and provided with vanes to permit observation of relative bearings. The instrument was named for one Pelorus, said to have been the pilot for Hannibal, circa 203 BC. Ancient use Harold Gatty described the use of a pelorus by Polynesians before the use of a compass. In equatorial waters the nightly course of stars overhead is nearly uniform during the year. This regularity simplified navigation for the Polynesians using a pelorus, or dummy compass: Reading from North to South, in their rising and setting positions, these stars are:List comes from Tolmacheva (1980:p. 183), based "with some reservations" on Tibbets (1971: p. 296, n. 133). The sidereal rose given in Lagan (2005p.66 has some differences, e.g. placing Orion's belt in East and Altair in EbN. : The true position of these stars is only approxima ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Navigational Equipment
Navigation is a field of study that focuses on the process of monitoring and controlling the motion, movement of a craft or vehicle from one place to another.Bowditch, 2003:799. The field of navigation includes four general categories: land navigation, marine navigation, aeronautic navigation, and space navigation. It is also the term of art used for the specialized knowledge used by navigators to perform navigation tasks. All navigational techniques involve locating the navigator's Position (geometry), position compared to known locations or patterns. Navigation, in a broader sense, can refer to any skill or study that involves the determination of position and Relative direction, direction. In this sense, navigation includes orienteering and pedestrian navigation. History In the European medieval period, navigation was considered part of the set of ''Artes mechanicae, seven mechanical arts'', none of which were used for long voyages across open ocean. Polynesian navigation ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fourier Series
A Fourier series () is a summation of harmonically related sinusoidal functions, also known as components or harmonics. The result of the summation is a periodic function whose functional form is determined by the choices of cycle length (or ''period''), the number of components, and their amplitudes and phase parameters. With appropriate choices, one cycle (or ''period'') of the summation can be made to approximate an arbitrary function in that interval (or the entire function if it too is periodic). The number of components is theoretically infinite, in which case the other parameters can be chosen to cause the series to converge to almost any ''well behaved'' periodic function (see Pathological and Dirichlet–Jordan test). The components of a particular function are determined by ''analysis'' techniques described in this article. Sometimes the components are known first, and the unknown function is ''synthesized'' by a Fourier series. Such is the case of a discrete-ti ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Thomson, 1st Baron Kelvin
William Thomson, 1st Baron Kelvin, (26 June 182417 December 1907) was a British mathematician, mathematical physicist and engineer born in Belfast. Professor of Natural Philosophy at the University of Glasgow for 53 years, he did important work in the mathematical analysis of electricity and formulation of the first and second laws of thermodynamics, and did much to unify the emerging discipline of physics in its contemporary form. He received the Royal Society's Copley Medal in 1883, was its president 1890–1895, and in 1892 was the first British scientist to be elevated to the House of Lords. Absolute temperatures are stated in units of kelvin in his honour. While the existence of a coldest possible temperature ( absolute zero) was known prior to his work, Kelvin is known for determining its correct value as approximately −273.15 degrees Celsius or −459.67 degrees Fahrenheit. The Joule–Thomson effect is also named in his honour. He worked closely with mathematics ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Frances And Joseph Gies
Frances Gies (June 10, 1915 – December 18, 2013) and Joseph Gies (October 8, 1916 – April 13, 2006) were historians and writers who collaborated on a number of books about the Middle Ages, and also wrote individual works. They were husband and wife. Joseph Gies graduated from the University of Michigan in 1939. Select bibliography Collaborations * (1969) ''Life in a Medieval City'', * (1972) ''Merchants and Moneymen: The Commercial Revolution, 1000-1500'' * (1974) ''Life in a Medieval Castle'' Crowell, * (1979) ''Life in a Medieval Castle'' * (1983) ''Leonard Of Pisa And The New Mathematics Of The Middle Ages'' * (1987) ''Marriage and the Family in the Middle Ages'' * (1990) ''Life in a Medieval Village'' * (1994) ''Cathedral, Forge, and Waterwheel : Technology and Invention in the Middle Ages'' HarperCollins * (1999) ''A Medieval Family: The Pastons of Fifteenth-Century England'' New York: HarperCollins * (2005) ''Daily Life in Medieval Times'', UK: Grange Books ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Amir Aczel
Amir Dan Aczel (; November 6, 1950 – November 26, 2015) was an Israeli-born American lecturer in mathematics and the history of mathematics and science, and an author of popular books on mathematics and science. Biography Amir D. Aczel was born in Haifa, Israel. Aczel's father was the captain of a passenger ship that sailed primarily in the Mediterranean Sea. When he was ten, Aczel's father taught his son how to steer a ship and navigate. This inspired Aczel's book ''The Riddle of the Compass''. Amir graduated from the Hebrew Reali School in Haifa, in 1969. When Aczel was 21, he studied at the University of California, Berkeley. He graduated with a BA in mathematics in 1975, and received a Master of Science in 1976. Several years later Aczel earned a Ph.D. in statistics from the University of Oregon. Aczel taught mathematics at universities in California, Alaska, Massachusetts, Italy, and Greece. He married his wife Debra in 1984 and had one daughter, Miriam, and one stepda ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
