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Mark Barr
James Mark McGinnis BarrFull name as listed in (May 18, 1871December 15, 1950) was an electrical engineer, physicist, inventor, and polymath known for proposing the standard notation for the golden ratio. Born in America, but with English citizenship, Barr lived in both London and New York City at different times of his life. Though remembered primarily for his contributions to abstract mathematics, Barr put much of his efforts over the years into the design of machines, including calculating machines. He won a gold medal at the 1900 Paris Exposition Universelle for an extremely accurate engraving machine. Life Barr was born in Pennsylvania, the son of Charles B. Barr and Ann M'Ginnis. He was educated in London, then worked for the Westinghouse Electric Company in Pittsburgh from 1887 to 1890. He started there as a draughtsman before becoming a laboratory assistant, and later an erection engineer. For two years in the early 1890s, he worked in New York City at the journal ''E ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electrical Engineer
Electrical engineering is an engineering discipline concerned with the study, design, and application of equipment, devices, and systems which use electricity, electronics, and electromagnetism. It emerged as an identifiable occupation in the latter half of the 19th century after commercialization of the electric telegraph, the telephone, and electrical power generation, distribution, and use. Electrical engineering is now divided into a wide range of different fields, including computer engineering, systems engineering, power engineering, telecommunications, radio-frequency engineering, signal processing, instrumentation, photovoltaic cells, electronics, and optics and photonics. Many of these disciplines overlap with other engineering branches, spanning a huge number of specializations including hardware engineering, power electronics, electromagnetics and waves, microwave engineering, nanotechnology, electrochemistry, renewable energies, mechatronics/control, and electrica ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
British Association For The Advancement Of Science
The British Science Association (BSA) is a charity and learned society founded in 1831 to aid in the promotion and development of science. Until 2009 it was known as the British Association for the Advancement of Science (BA). The current Chief Executive is Katherine Mathieson. The BSA's mission is to get more people engaged in the field of science by coordinating, delivering, and overseeing different projects that are suited to achieve these goals. The BSA "envisions a society in which a diverse group of people can learn and apply the sciences in which they learn." and is managed by a professional staff located at their Head Office in the Wellcome Wolfson Building. The BSA offers a wide variety of activities and events that both recognize and encourage people to be involved in science. These include the British Science Festival, British Science Week, the CREST Awards, Huxley Summit, Media Fellowships Scheme, along with regional and local events. History Foundation The Asso ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Ball Race
A ball is a round object (usually spherical, but can sometimes be ovoid) with several uses. It is used in ball games, where the play of the game follows the state of the ball as it is hit, kicked or thrown by players. Balls can also be used for simpler activities, such as catch or juggling. Balls made from hard-wearing materials are used in engineering applications to provide very low friction bearings, known as ball bearings. Black-powder weapons use stone and metal balls as projectiles. Although many types of balls are today made from rubber, this form was unknown outside the Americas until after the voyages of Columbus. The Spanish were the first Europeans to see the bouncing rubber balls (although solid and not inflated) which were employed most notably in the Mesoamerican ballgame. Balls used in various sports in other parts of the world prior to Columbus were made from other materials such as animal bladders or skins, stuffed with various materials. As balls are one ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Tractrix
In geometry, a tractrix (; plural: tractrices) is the curve along which an object moves, under the influence of friction, when pulled on a horizontal plane by a line segment attached to a pulling point (the ''tractor'') that moves at a right angle to the initial line between the object and the puller at an infinitesimal speed. It is therefore a curve of pursuit. It was first introduced by Claude Perrault in 1670, and later studied by Isaac Newton (1676) and Christiaan Huygens (1693). Mathematical derivation Suppose the object is placed at (or in the example shown at right), and the puller at the origin (mathematics), origin, so is the length of the pulling thread (4 in the example at right). Then the puller starts to move along the axis in the positive direction. At every moment, the thread will be tangent to the curve described by the object, so that it becomes completely determined by the movement of the puller. Mathematically, if the coordinates of the object are , the o ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Bronx
The Bronx () is a borough of New York City, coextensive with Bronx County, in the state of New York. It is south of Westchester County; north and east of the New York City borough of Manhattan, across the Harlem River; and north of the New York City borough of Queens, across the East River. The Bronx has a land area of and a population of 1,472,654 in the 2020 census. If each borough were ranked as a city, the Bronx would rank as the ninth-most-populous in the U.S. Of the five boroughs, it has the fourth-largest area, fourth-highest population, and third-highest population density.New York State Department of Health''Population, Land Area, and Population Density by County, New York State – 2010'' retrieved on August 8, 2015. It is the only borough of New York City not primarily on an island. With a population that is 54.8% Hispanic as of 2020, it is the only majority-Hispanic county in the Northeastern United States and the fourth-most-populous nationwide. The Bronx ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Century Association
The Century Association is a private social, arts, and dining club in New York City, founded in 1847. Its clubhouse is located at 7 West 43rd Street near Fifth Avenue in Midtown Manhattan. It is primarily a club for men and women with distinction in literature or the arts. The Century Association was founded by members of New York's Sketch Club; preceding clubs also included the National Academy of Design, the Bread and Cheese Club, and the Column. Traditionally a men's club, women first became active in club life in the early 1900s; the organization began admitting women as members in 1988. Named after the first 100 people proposed as members, the first meeting on January 13, 1847 created the club known as the Century; it was incorporated in 1857. It was first housed at 495 Broadway in Lower Manhattan; the club gradually moved uptown, leading to the club's construction of its current location in 1899. During the Civil War, it became headquarters to the U.S. Sanitary Commission ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard Business School
Harvard Business School (HBS) is the graduate business school of Harvard University, a private research university in Boston, Massachusetts. It is consistently ranked among the top business schools in the world and offers a large full-time MBA program, management-related doctoral programs, and many executive education programs. It owns Harvard Business Publishing, which publishes business books, leadership articles, case studies, and the monthly ''Harvard Business Review''. It is also home to the Baker Library/Bloomberg Center. History The school was established in 1908. Initially established by the humanities faculty, it received independent status in 1910, and became a separate administrative unit in 1913. The first dean was historian Edwin Francis Gay (1867–1946). Yogev (2001) explains the original concept: :This school of business and public administration was originally conceived as a school for diplomacy and government service on the model of the French '' Ecole des S ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Elyria, Ohio
Elyria ( ) is a city in the Greater Cleveland metropolitan statistical area and the county seat of Lorain County, Ohio, United States, located at the forks of the Black River in Northeast Ohio 23 miles southwest of Cleveland. As of the 2020 census, the city had a population of 52,656.2020 United States Census, Elyria Total population https://www.census.gov/search-results.html?searchType=web&cssp=SERP&q=Elyria%20city,%20Ohio The city is home to Lorain County Community College. Etymology The city's name is derived from the surname of its founder, Heman Ely, and Illyria, the historical name used by ancient Greeks and Romans to refer to the western Balkans. (Elyria) History The village of Elyria was founded in 1817 by Heman Ely, who built a log house, dam, gristmill, and sawmill on the village's site along the Black River. Ely began to build more houses to accommodate European-American settlers migrating to what was, at that time, within Huron County, Ohio. By the time Ely died i ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Thomas North Whitehead
Thomas North Whitehead (31 December 1891, Cambridge, England – 22 November 1969, Cambridge, Massachusetts) was an early human relations theorist and researcher, best known for ''The Industrial Worker'', a two-volume statistical analysis of the Hawthorne experiments. He worked as a professor at Harvard University and Radcliffe College, and in the British Foreign Office during World War II. Early life and education Whitehead was the son of the prominent English philosopher Alfred North Whitehead, and was known as "North" to his family. He read economics at Trinity College, Cambridge, earning a B.A. in 1913. He then did graduate studies in mechanical engineering at University College London. Government service Whitehead served as an army officer in France and East Africa during World War I, taking a leave from his graduate studies to do so. On the completion of his studies in 1920 after the war, he began working for the Admiralty, and remained there until his 1931 move to Har ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Henry Osborn Taylor
Henry Osborn Taylor (December 5, 1856 – April 13, 1941) was an American historian and legal scholar. Career Taylor graduated from Harvard University in 1878 and, later, from Columbia Law School. He later received honorary degrees from Harvard and Columbia. Taylor was a philosopher and the author of several important works on ancient and medieval history. In 1927, he served as the president of the American Historical Association. Personal life Taylor was married to the philanthropist Julia Isham (1866–1939). Julia, the daughter of prominent merchant William Bradley Isham, was the sister of historian Charles Bradford Isham (who married Mamie Lincoln, granddaughter of President Abraham Lincoln) and artist Samuel Isham. Julia donated property from her late father's estate, which became Isham Park in Inwood, Manhattan, and gave generously to Harvard and Smith Colleges. After a week's illness, Taylor died of pneumonia at his home, 135 East 66th Street in New York City on A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Harvard University
Harvard University is a private Ivy League research university in Cambridge, Massachusetts. Founded in 1636 as Harvard College and named for its first benefactor, the Puritan clergyman John Harvard, it is the oldest institution of higher learning in the United States and one of the most prestigious and highly ranked universities in the world. The university is composed of ten academic faculties plus Harvard Radcliffe Institute. The Faculty of Arts and Sciences offers study in a wide range of undergraduate and graduate academic disciplines, and other faculties offer only graduate degrees, including professional degrees. Harvard has three main campuses: the Cambridge campus centered on Harvard Yard; an adjoining campus immediately across Charles River in the Allston neighborhood of Boston; and the medical campus in Boston's Longwood Medical Area. Harvard's endowment is valued at $50.9 billion, making it the wealthiest academic institution in the world. Endowment inco ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Hamlin Garland
Hannibal Hamlin Garland (September 14, 1860 – March 4, 1940) was an American novelist, poet, essayist, short story writer, Georgist, and psychical researcher. He is best known for his fiction involving hard-working Midwestern farmers. Biography Hannibal Hamlin Garland was born on a farm near West Salem, Wisconsin, on September 14, 1860, the second of four children of Richard Garland of Maine and Charlotte Isabelle McClintock. The boy was named after Hannibal Hamlin, the vice-president under Abraham Lincoln. He lived on various Midwestern farms throughout his young life, but settled in Boston, Massachusetts, in 1884 to pursue a career in writing. He read diligently in the Boston Public Library. There he became enamored with the ideas of Henry George, and his Single Tax Movement. George's ideas came to influence a number of his works, such as ''Main-Travelled Roads'' (1891), ''Prairie Folks'' (1892), and his novel '' Jason Edwards'' (1892). ''Main-Travelled Roads'' was hi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
