| 词条 | Alexander Bain (inventor) |
| 释义 |
| name = Alexander Bain | image = Alexander Bain.jpg | caption = | birth_date = 12 October 1810 | birth_place =Watten, Caithness, Scotland | death_date = {{death date and age|1877|1|2|1810|10|12|df=y}} | death_place = Broomhill, Kirkintilloch, Scotland | occupation = instrument inventor, technician, and clockmaker | salary = | networth = | spouse = | website = | footnotes = }} Alexander Bain (12 October 1810 – 2 January 1877)[1] was a Scottish inventor and engineer who was first to invent and patent the electric clock. He installed the railway telegraph lines between Edinburgh and Glasgow. Early lifeBain was born in Houstry, Caithness, Scotland. He was baptised in the local kirk on 22 November 1810.[2] His father was a crofter. He had a twin sister, Margaret, and, in total, he had six sisters and six brothers. Bain did not excel in school and was apprenticed to a clockmaker in Wick. CareerHaving learned the art of clockmaking, he went to Edinburgh, and in 1837 to London, where he obtained work as a journeyman in Clerkenwell. Bain frequented the lectures at the Polytechnic Institution and the Adelaide Gallery and later constructed his own workshop in Hanover Street. Electric clocksIn 1840, desperate for money to develop his inventions, Bain mentioned his financial problems to the editor of the Mechanics Magazine, who introduced him to Sir Charles Wheatstone. Bain demonstrated his models to Wheatstone, who, when asked for his opinion, said "Oh, I shouldn't bother to develop these things any further! There's no future in them."[3] Three months later Wheatstone demonstrated an electric clock to the Royal Society, claiming it was his own invention. However, Bain had already applied for a patent for it. Wheatstone tried to block Bain's patents, but failed. When Wheatstone organised an Act of Parliament to set up the Electric Telegraph Company, the House of Lords summoned Bain to give evidence, and eventually compelled the company to pay Bain £10,000 and give him a job as manager, causing Wheatstone to resign. Bain's first patent was dated 11 January 1841, and was in the names of John Barwise, chronometer maker, and Alexander Bain, mechanist. It describes his electric clock which uses a pendulum kept moving by electromagnetic impulses. He improved on this in later patents, including a proposal to derive the required electricity from an "earth battery", which consisted of plates of zinc and copper buried in the ground. In December 1841, Bain in conjunction with Lieutenant Thomas Wright RN, patented a method for using electricity to control railway engines by turning off steam, marking time, giving signals, and printing information at different locations. The most significant idea incorporated in the patent was his plan for inverting the needle telegraph earlier developed by Ampere, Wheatstone and others: instead of making signals by a pivoted magnetic needle under the influence of an electromagnet, he made them by suspending a movable coil between the poles of a fixed magnet. A similar concept appears in Sir William Thomson's siphon recorder. Bain also proposed to make the coil record messages by printing them, an idea he developed further in a subsequent patent. His telegraph was also successful abroad: "The initial Austrian Bain instruments were made by Johann Michael Ekling in Vienna, and later by the k.k. Telegraphenwerkstätte Wein, the Imperial Royal Telegraph Workshops Vienna."[4]
Surviving examplesBain's extant electric clocks come from two stages of development between the 1840s and the 1860s. Examples can be seen in the National Museum of Scotland, the National Maritime Museum of London, the London Science Museum and the Deutsches Uhrenmuseum. The most rare and interesting mantel clocks are in private hands. One featured in the "Electrifying Time" exhibition in 1977 at the London Science Museum. Bain sometimes found complex and ornate solutions to relatively simple, although not easy to solve problems. The most complex, his mantel clock, worked on an electro-magnetic pull push, pull push for each complete period of swing employing a pendulum with opposing magnetic fields. At a very similar time, Matthäus Hipp constructed a more simple and reliable system which used a simple toggle switch to impulse the pendulum every so often. Facsimile machine{{main|Fax}}Bain's and Bakewell's laboratory mechanisms reproduced poor quality images and were not viable systems because the transmitter and receiver were never truly synchronized. In 1861, the first practical operating electro-mechanical commercially exploited telefax machine, the Pantelegraph, was invented by the Italian physicist Giovanni Caselli. He introduced the first commercial telefax service between Paris and Lyon at least 11 years before the invention of workable telephones.[7][8] Chemical telegraphOn 12 December 1846, Bain, who was then living in Edinburgh, patented a chemical telegraph. He had seen that the Morse and other telegraphs then in use were comparatively slow, due to the mechanical inertia of their moving parts, and realized that the signal current could be used to make a readable mark on a moving paper tape soaked in a mixture of ammonium nitrate and potassium ferrocyanide, which gave a blue mark when a current was passed through it. The speed at which marks could be made on the paper was so high that hand signalling could not keep up with it, and so Bain devised a method of automatic signalling using punched paper tape. The concept was later used by Wheatstone in his automatic sender. Bain's chemical telegraph was tried between Paris and Lille, and attained a speed of 282 words in 52 seconds, a great advance on Morse's telegraph which could only give about 40 words per minute. In England Bain's telegraph was used on the wires of the Electric Telegraph Company to a limited extent, and in 1850 it was used in America by Henry O'Reilly. However, it incurred the hostility of Samuel Morse, who obtained an injunction against it on the grounds that the paper tape and alphabet used fell under his patent. Consequently, by 1859 Bain's telegraph was in use on only one line and never really entered general usage. Later lifeInitially Bain made a considerable sum from his inventions but lost his wealth in poor investments. In 1873, Sir William Thomson, Sir William Siemens, Latimer Clark and others obtained a Civil List pension for Bain from Prime Minister William Ewart Gladstone of £80 per year. Death and legacyBain was buried in the Auld Aisle Cemetery, Kirkintilloch. It was restored in 1959. The headstone had a fallacious date of death (1876) which was later corrected to 1877. JD Wetherspoons pub in Wick, close to where Alexander Bain served his apprenticeship, is now named 'The Alexander Bain' after the inventor. Also, as a tribute to his inventions, the main BT building in Glasgow is named Alexander Bain House. One of the earliest examples of an electrically impulsed pendulum clock is on display at the Deutsches Uhrenmuseum. In 2016 he was awarded the Technology & Engineering Emmy Award "for his pioneering work in the transmission of images".[9] References1. ^{{cite book|author1=Lance Day|author2=Ian McNeil|title=Biographical Dictionary of the History of Technology|url=https://books.google.com/books?id=m8TsygLyfSMC&pg=PA63|date=2002|publisher=Routledge|isbn=978-1-134-65020-0|pages=63}} 2. ^{{cite book|author=Valerie Campbell|title=The Caithness Influence: Diverse Lives of Distinction|url=https://books.google.com/books?id=3tkgywAACAAJ|year=2011|publisher=Whittles Publishing Limited|isbn=978-1-84995-039-8}} 3. ^Lord Robert Winston, Bad Ideas?: An arresting history of our inventions, London 2010, p. 221 4. ^http://distantwriting.co.uk/bain.html 5. ^Alexander Bain, A Short History of the Electric Clocks, London 1852, p. 3 6. ^J. Polhemus, The Leading Telegraph Patents, Including Original and Reissued Patents, of S. F. B. Morse, 1878, p.154 7. ^Istituto Tecnico Industriale, Rome, Italy. Italian biography of Giovanni Caselli 8. ^The Hebrew University of Jerusalem - Giovanni Caselli biography {{webarchive |url=https://web.archive.org/web/20080506000000/http://chem.ch.huji.ac.il/history/caselli.html |date=6 May 2008 }} 9. ^{{cite news | url=https://www.bbc.co.uk/news/uk-scotland-glasgow-west-35493485| publisher=BBC News | title=TV pioneer's Emmy award arrives in Scotland| date=4 February 2016| accessdate=4 February 2016}} Further reading
Patents
External links{{Commons category|Alexander Bain (Clockmaker)}}
9 : Scottish inventors|1810 births|1877 deaths|Scottish clockmakers|Scottish electrical engineers|People from Caithness|Technicians|19th-century Scottish people|People from Kirkintilloch |
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