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Samuel Alfred Varley
Samuel Alfred Varley (1832–1921) was an English electrical engineer. He was one of ten children born to Cornelius Varley and Elizabeth Livermore Straker. Career In 1852, Samuel started work for the Electric Telegraph Company in Manchester. His brother, C. F. Varley, had been employed by the same company since 1849. During the 1850s, Samuel was involved in supervising field telegraphs in the Crimean War. He also published papers on cable signalling. In 1861, Samuel took over the running of a telegraph factory in London, owned by his father. Inventions In 1866, he was among the first to make a self-excited dynamo. Other contenders were Charles Wheatstone and Werner von Siemens. He also invented compound winding for dynamos. In 1873, he read a paper at the Society of Engineers. The subject was "Railway Train Intercommunication" and he described a system fitted to the London and North Western Railway Royal Train. Family In 1860, Samuel married Emily Andrews and the couple ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Brackets
A bracket is either of two tall fore- or back-facing punctuation marks commonly used to isolate a segment of text or data from its surroundings. They come in four main pairs of shapes, as given in the box to the right, which also gives their names, that vary between British English, British and American English. "Brackets", without further qualification, are in British English the ... marks and in American English the ... marks. Other symbols are repurposed as brackets in specialist contexts, such as International Phonetic Alphabet#Brackets and transcription delimiters, those used by linguists. Brackets are typically deployed in symmetric pairs, and an individual bracket may be identified as a "left" or "right" bracket or, alternatively, an "opening bracket" or "closing bracket", respectively, depending on the Writing system#Directionality, directionality of the context. In casual writing and in technical fields such as computing or linguistic analysis of grammar, brackets ne ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Shunt Generator
A shunt generator is a type of electric generator in which field winding and armature winding are connected in parallel, and in which the armature supplies both the load current and the field current for the excitation (generator is therefore self excited). Generator field connections A shunt field (and any series resistor used for adjustment) may be directly connected across the armature terminals in parallel with the load. Where the machine has a series compounding winding, the field may be connected at the armature side (short shunt) or load side (long shunt). The different connections give different voltage regulation characteristics on load. So as it is connected in shunt it has constant characteristics. Characteristic Current in the field windings of a shunt-wound generator is (approximately) independent of the load current, because currents in parallel branches are independent of each other. Since field current, and therefore field strength, is little affected by l ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Cornelius Varley
Cornelius Varley, FRSA (21 November 1781 – 2 October 1873) was a British water-colour painter and optical instrument-maker. He invented the graphic telescope and the graphic microscope. Biography Varley was born at Hackney, then a village north of London, on 21 November 1781. He was a younger brother of John Varley, a watercolour painter and astrologer, and a close friend of William Blake. He was educated by his uncle, a scientific instrument maker, and under him acquired a knowledge of the natural sciences. Around 1800, he joined his brother in a tour through Wales, and began the study of art. He was soon engaged in teaching drawing. From 1803 to 1859 he was an occasional exhibitor at the Royal Academy and he also contributed regularly to the displays of the Water-Colour Society, of which, in 1803, he was one of the founders, and of which he continued a member until 1821. He died in Hampstead on 2 October 1873. Works Varley's artistic works consist mainly of carefully f ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Electric Telegraph Company
The Electric Telegraph Company (ETC) was a British telegraph company founded in 1846 by William Fothergill Cooke and John Ricardo. It was the world's first public telegraph company. The equipment used was the Cooke and Wheatstone telegraph, an electrical telegraph developed a few years earlier in collaboration with Charles Wheatstone. The system had been taken up by several railway companies for signalling purposes, but in forming the company Cooke intended to open up the technology to the public at large. The ETC had a monopoly of electrical telegraphy until the formation of the Magnetic Telegraph Company (commonly called the ''Magnetic'') who used a different system which did not infringe the ETC's patents. The Magnetic became the chief rival of the ETC and the two of them dominated the market even after further companies entered the field. The ETC was heavily involved in laying submarine telegraph cables, including lines to the Netherlands, Ireland, the Channel Island ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Manchester
Manchester () is a city and the metropolitan borough of Greater Manchester, England. It had an estimated population of in . Greater Manchester is the third-most populous metropolitan area in the United Kingdom, with a population of 2.92 million, and the largest in Northern England. It borders the Cheshire Plain to the south, the Pennines to the north and east, and the neighbouring city of Salford to the west. The city borders the boroughs of Trafford, Metropolitan Borough of Stockport, Stockport, Tameside, Metropolitan Borough of Oldham, Oldham, Metropolitan Borough of Rochdale, Rochdale, Metropolitan Borough of Bury, Bury and City of Salford, Salford. The history of Manchester began with the civilian settlement associated with the Roman fort (''castra'') of Mamucium, ''Mamucium'' or ''Mancunium'', established on a sandstone bluff near the confluence of the rivers River Medlock, Medlock and River Irwell, Irwell. Throughout the Middle Ages, Manchester remained a ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crimean War
The Crimean War was fought between the Russian Empire and an alliance of the Ottoman Empire, the Second French Empire, the United Kingdom of Great Britain and Ireland, and the Kingdom of Sardinia (1720–1861), Kingdom of Sardinia-Piedmont from October 1853 to February 1856. Geopolitical causes of the war included the "Eastern question" (Decline and modernization of the Ottoman Empire, the decline of the Ottoman Empire, the "sick man of Europe"), expansion of Imperial Russia in the preceding Russo-Turkish wars, and the British and French preference to preserve the Ottoman Empire to maintain the European balance of power, balance of power in the Concert of Europe. The flashpoint was a dispute between France and Russia over the rights of Catholic Church, Catholic and Eastern Orthodox Church, Orthodox minorities in Palestine (region), Palestine. After the Sublime Porte refused Nicholas I of Russia, Tsar Nicholas I's demand that the Empire's Orthodox subjects were to be placed unde ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Charles Wheatstone
Sir Charles Wheatstone (; 6 February 1802 – 19 October 1875) was an English physicist and inventor best known for his contributions to the development of the Wheatstone bridge, originally invented by Samuel Hunter Christie, which is used to measure an unknown electrical resistance, and as a major figure in the development of telegraphy. His other contributions include the English concertina, the stereoscope (a device for displaying three-dimensional images) and the Playfair cipher (an encryption technique). Life Charles Wheatstone was born in Barnwood, Gloucestershire. His father, W. Wheatstone, was a music-seller in the town, who moved to 128 Pall Mall, London, four years later, becoming a teacher of the flute. Charles, the second son, went to a village school, near Gloucester, and afterwards to several institutions in London. One of them was in Kennington, and kept by a Mrs. Castlemaine, who was astonished at his rapid progress. From another he ran away, but was captured ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Werner Von Siemens
Ernst Werner Siemens ( von Siemens from 1888; ; ; 13 December 1816 – 6 December 1892) was a German electrical engineer, inventor and industrialist. Siemens's name has been adopted as the SI unit of electrical conductance, the siemens. He founded the electrical and telecommunications conglomerate Siemens and invented the electric tram, trolley bus, electric locomotive and electric elevator. His dynamo laid the foundation for the modern age of electricity and he was involved in the development of the electric car. Biography Early years Ernst Werner Siemens was born in Lenthe, today part of Gehrden, near Hannover, in the Kingdom of Hanover in the German Confederation, the third child (of fourteen) of Christian Ferdinand Siemens (31 July 1787 – 16 January 1840) and wife Eleonore Deichmann (1792 – 8 July 1839). His father was a tenant farmer of the Siemens family, an old family of Goslar, documented since 1384. Carl Heinrich von Siemens and Carl Wilhelm Si ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
London And North Western Railway
The London and North Western Railway (LNWR, L&NWR) was a British railway company between 1846 and 1922. In the late 19th century, the LNWR was the largest joint stock company in the world. Dubbed the "Premier Line", the LNWR's main line connected four of the largest cities in England; London, Birmingham, Manchester and Liverpool, and, through cooperation with their Scottish partners, the Caledonian Railway also connected Scotland's largest cities of Glasgow and Edinburgh. Today this route is known as the West Coast Main Line. The LNWR's network also extended into Wales and Yorkshire. In 1923, it became a constituent of the London, Midland and Scottish (LMS) railway, and, in 1948, the London Midland Region of British Railways. History The company was formed on 16 July 1846 by the ( 9 & 10 Vict. c. cciv), which authorised the amalgamation of the Grand Junction Railway, London and Birmingham Railway and the Manchester and Birmingham Railway. This move was prompted, in ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Winchester
Winchester (, ) is a City status in the United Kingdom, cathedral city in Hampshire, England. The city lies at the heart of the wider City of Winchester, a local government Districts of England, district, at the western end of the South Downs National Park, on the River Itchen, Hampshire, River Itchen. It is south-west of London and from Southampton, its nearest city. At the 2021 census, the built-up area of Winchester had a population of 48,478. The wider City of Winchester district includes towns such as New Alresford, Alresford and Bishop's Waltham and had a population of 127,439 in 2021. Winchester is the county town of Hampshire and contains the head offices of Hampshire County Council. Winchester developed from the Roman Britain, Roman town of Venta Belgarum, which in turn developed from an Iron Age ''oppidum''. Winchester was one of if not the most important cities in England until the Norman Conquest in the eleventh century. It now has become one of the most expensive ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1832 Births
Events January–March * January 6 – Abolitionist William Lloyd Garrison founds the New-England Anti-Slavery Society. * January 13 – The Christmas Rebellion of slaves is brought to an end in Jamaica, after the island's white planters organize militias and the British Army sends companies of the 84th regiment to enforce martial law. More than 300 of the slave rebels will be publicly hanged for their part in the destruction. * February 6 – The Swan River Colony is renamed Western Australia. * February 9 – The Florida Legislative Council grants a city charter for Jacksonville, Florida. * February 12 ** Ecuador annexes the Galápagos Islands. ** A cholera epidemic in London claims at least 3,000 lives; the contagion spreads to France and North America later this year. * February 28 – Charles Darwin and the crew of arrive at South America for the first time. * March 24 – In Hiram, Ohio, a group of men beat, tar and feather Mormon leader Joseph Smith. Apr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
1921 Deaths
Events January * January 2 ** The Association football club Cruzeiro Esporte Clube, from Belo Horizonte, is founded as the multi-sports club Palestra Italia by Italian expatriates in First Brazilian Republic, Brazil. ** The Spanish liner ''Santa Isabel'' breaks in two and sinks off Villa Garcia, Mexico, with the loss of 244 of the 300 people on board. * January 16 – The Marxist Left in Slovakia and the Transcarpathian Ukraine holds its founding congress in Ľubochňa. * January 17 – The first recorded public performance of the illusion of "sawing a woman in half" is given by English stage magician P. T. Selbit at the Finsbury Park Empire variety theatre in London. * January 20 – British K-class submarine HMS K5, HMS ''K5'' sinks in the English Channel; all 57 on board are lost. * January 21 – The full-length Silent film, silent comedy drama film ''The Kid (1921 film), The Kid'', written, produced, directed by and starring Charlie Chaplin (in his ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
