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John Robertson (mathematician)
John Robertson (1712–1776) was an English mathematician, and a Fellow, clerk and librarian of the Royal Society. His book ''The Elements of Navigation'' became a classic textbook. Life Initially apprenticed to a trade, Robertson became a teacher of mathematics. He was elected a Fellow of the Royal Society in 1741. In 1747 he was appointed master of the Royal Mathematical School at Christ's Hospital, assistant there to James Hodgson. In 1755 Robertson became first master of the Royal Naval Academy, Portsmouth. Having lost this appointment in 1766 through intrigues of the second master, he returned to London, and was appointed clerk and librarian to the Royal Society on 7 January 1768. This post he held till his death, on 11 December 1776. Writings and scientific work Robertson published his first book ''Completed Treatise on Mensuration'' in 1739 and was subsequently elected a fellow of the Royal Society in 1741. In 1747 he published the first edition of ''A Treatise of Such Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Royal Society
The Royal Society, formally The Royal Society of London for Improving Natural Knowledge, is a learned society and the United Kingdom's national academy of sciences. The society fulfils a number of roles: promoting science and its benefits, recognising excellence in science, supporting outstanding science, providing scientific advice for policy, education and public engagement and fostering international and global co-operation. Founded on 28 November 1660, it was granted a royal charter by King Charles II as The Royal Society and is the oldest continuously existing scientific academy in the world. 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 of Council and the President are elected from and by its Fellows, the basic members of the society, who are themselves elected by existing Fellows. , there are about 1,700 fellows, allowed to use the postnominal title FRS (Fellow of the ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
William Wales (astronomer)
William Wales (1734? – 29 December 1798) was a British mathematician and astronomer who sailed on Captain Cook's second voyage of discovery, then became Master of the Royal Mathematical School at Christ's Hospital and a Fellow of the Royal Society. Early life Wales was born around 1734 to John and Sarah Wales and was baptised in Warmfield (near the West Yorkshire town of Wakefield) that year. As a youth, according to the historian John Cawte Beaglehole, Wales travelled south in the company of a Mr Holroyd, who became a plumber in the service of George III. By the mid-1760s, Wales was contributing to ''The Ladies' Diary''. In 1765 he married Mary Green, sister of the astronomer Charles Green. In 1765, Wales was employed by the Astronomer Royal Nevil Maskelyne as a ''computer'', calculating ephemerides that could be used to establish the longitude of a ship, for Maskelyne's ''Nautical Almanac''. 1769 transit of Venus and wintering at Hudson Bay As part of the plans of the Roya ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Librarians
English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national identity, an identity and common culture ** English language in England, a variant of the English language spoken in England * English languages (other) * English studies, the study of English language and literature * ''English'', an Amish term for non-Amish, regardless of ethnicity Individuals * English (surname), a list of notable people with the surname ''English'' * People with the given name ** English McConnell (1882–1928), Irish footballer ** English Fisher (1928–2011), American boxing coach ** English Gardner (b. 1992), American track and field sprinter Places United States * English, Indiana, a town * English, Kentucky, an unincorporated community * English, Brazoria County, Texas, an unincorporated community * Engli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
18th-century English Educators
The 18th century lasted from January 1, 1701 (Roman numerals, MDCCI) to December 31, 1800 (Roman numerals, MDCCC). During the 18th century, elements of Age of Enlightenment, Enlightenment thinking culminated in the American Revolution, American, French Revolution, French, and Haitian Revolution, Haitian Revolutions. During the century, History of slavery, slave trading and human trafficking expanded across the shores of the Atlantic Ocean, Atlantic, while declining in Russian Empire, Russia, Qing dynasty, China, and Joseon, Korea. Revolutions began to challenge the legitimacy of monarchical and aristocratic power structures, including the structures and beliefs that Proslavery, supported slavery. The Industrial Revolution began during mid-century, leading to radical changes in Society, human society and the Natural environment, environment. Western historians have occasionally defined the 18th century otherwise for the purposes of their work. For example, the "short" 18th cen ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
English Mathematicians
English usually refers to: * English language * English people English may also refer to: Peoples, culture, and language * ''English'', an adjective for something of, from, or related to England ** English national identity, an identity and common culture ** English language in England, a variant of the English language spoken in England * English languages (other) * English studies, the study of English language and literature * ''English'', an Amish term for non-Amish, regardless of ethnicity Individuals * English (surname), a list of notable people with the surname ''English'' * People with the given name ** English McConnell (1882–1928), Irish footballer ** English Fisher (1928–2011), American boxing coach ** English Gardner (b. 1992), American track and field sprinter Places United States * English, Indiana, a town * English, Kentucky, an unincorporated community * English, Brazoria County, Texas, an unincorporated community * Engli ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1776 Deaths
Events January–February * January 1 – American Revolutionary War – Burning of Norfolk: The town of Norfolk, Virginia is destroyed, by the combined actions of the British Royal Navy and occupying Patriot forces. * January 10 – American Revolution – Thomas Paine publishes his pamphlet ''Common Sense'', arguing for independence from British rule in the Thirteen Colonies. * January 20 – American Revolution – South Carolina Loyalists led by Robert Cunningham sign a petition from prison, agreeing to all demands for peace by the formed state government of South Carolina. * January 24 – American Revolution – Henry Knox arrives at Cambridge, Massachusetts, with the artillery that he has transported from Fort Ticonderoga. * February 17 – Edward Gibbon publishes the first volume of ''The History of the Decline and Fall of the Roman Empire''. * February 27 – American Revolution – Battle of Moore's Creek Bridge: ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1712 Births
Year 171 ( CLXXI) was a common year starting on Monday (link will display the full calendar) of the Julian calendar. At the time, it was known as the Year of the Consulship of Severus and Herennianus (or, less frequently, year 924 ''Ab urbe condita''). The denomination 171 for this year has been used since the early medieval period, when the Anno Domini calendar era became the prevalent method in Europe for naming years. Events By place Roman Empire * Emperor Marcus Aurelius forms a new military command, the ''praetentura Italiae et Alpium''. Aquileia is relieved, and the Marcomanni are evicted from Roman territory. * Marcus Aurelius signs a peace treaty with the Quadi and the Sarmatian Iazyges. The Germanic tribes of the Hasdingi (Vandals) and the Lacringi become Roman allies. * Armenia and Mesopotamia become protectorates of the Roman Empire. * The Costoboci cross the Danube (Dacia) and ravage Thrace in the Balkan Peninsula. They reach Eleusis, near Athens, and destr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Mason–Dixon Line
The Mason–Dixon line, also called the Mason and Dixon line or Mason's and Dixon's line, is a demarcation line separating four U.S. states, forming part of the borders of Pennsylvania, Maryland, Delaware, and West Virginia (part of Virginia until 1863). It was surveyed between 1763 and 1767 by Charles Mason and Jeremiah Dixon as part of the resolution of a border dispute involving Maryland, Pennsylvania, and Delaware in colonial America. The dispute had its origins almost a century earlier in the somewhat confusing proprietary grants by King Charles I to Lord Baltimore (Maryland) and by King Charles II to William Penn (Pennsylvania and Delaware). The largest, east-west portion of the Mason–Dixon line along the southern Pennsylvania border later became known, informally, as the boundary between the Southern slave states and Northern free states. This usage came to prominence during the debate around the Missouri Compromise of 1820, when drawing boundaries between slave ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Surveying
Surveying or land surveying is the technique, profession, art, and science of determining the terrestrial two-dimensional or three-dimensional positions of points and the distances and angles between them. A land surveying professional is called a land surveyor. These points are usually on the surface of the Earth, and they are often used to establish maps and boundaries for ownership, locations, such as the designed positions of structural components for construction or the surface location of subsurface features, or other purposes required by government or civil law, such as property sales. Surveyors work with elements of geodesy, geometry, trigonometry, regression analysis, physics, engineering, metrology, programming languages, and the law. They use equipment, such as total stations, robotic total stations, theodolites, GNSS receivers, retroreflectors, 3D scanners, LiDAR sensors, radios, inclinometer, handheld tablets, optical and digital levels, subsurface locators, d ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
John Harrison
John Harrison ( – 24 March 1776) was a self-educated English Carpentry, carpenter and clockmaker who invented the marine chronometer, a long-sought-after device for solving the History of longitude, problem of calculating longitude while at sea. Harrison's solution revolutionized navigation and greatly increased the safety of long-distance sea travel. The problem he solved was considered so important following the Scilly naval disaster of 1707 that the Parliament of Great Britain, British Parliament offered financial rewards of up to £20,000 (equivalent to £ in ) under the 1714 Longitude Act. In 1730, Harrison presented his first design, and worked over many years on improved designs, making several advances in time-keeping technology, finally turning to what were called sea watches. Harrison gained support from the Board of Longitude, Longitude Board in building and testing his designs. Toward the end of his life, he received recognition and a reward from Parliament. Harri ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Calibrated
In measurement technology and metrology, calibration is the comparison of measurement values delivered by a device under test with those of a calibration standard of known accuracy. Such a standard could be another measurement device of known accuracy, a device generating the quantity to be measured such as a voltage, a sound tone, or a physical artifact, such as a meter ruler. The outcome of the comparison can result in one of the following: * no significant error being noted on the device under test * a significant error being noted but no adjustment made * an adjustment made to correct the error to an acceptable level Strictly speaking, the term "calibration" means just the act of comparison and does not include any subsequent adjustment. The calibration standard is normally traceable to a national or international standard held by a metrology body. BIPM Definition The formal definition of calibration by the International Bureau of Weights and Measures (BIPM) is the follo ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Slide Rule
The slide rule is a mechanical analog computer which is used primarily for multiplication and division, and for functions such as exponents, roots, logarithms, and trigonometry. It is not typically designed for addition or subtraction, which is usually performed using other methods. Maximum accuracy for standard linear slide rules is about three decimal significant digits, while scientific notation is used to keep track of the order of magnitude of results. Slide rules exist in a diverse range of styles and generally appear in a linear, circular or cylindrical form, with slide rule scales inscribed with standardized Graduation (instrument), graduated markings. Slide rules manufactured for specialized fields such as aviation or finance typically feature additional scales that aid in specialized calculations particular to those fields. The slide rule is closely related to nomograms used for application-specific computations. Though similar in name and appearance to a standard ruler ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
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