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• Tide-predicting_machine abstract "A tide-predicting machine was a special-purpose mechanical analog computer of the late 19th and early 20th centuries, constructed and set up to predict the ebb and flow of sea tides and the irregular variations in their heights – which change in mixtures of rhythms, that never (in the aggregate) repeat themselves exactly. Its purpose was to shorten the laborious and error-prone computations of tide-prediction. Such machines usually provided predictions valid from hour to hour and day to day for a year or more ahead. The first tide-predicting machine, designed and built in 1872-3, and followed by two larger machines on similar principles in 1876 and 1879, was conceived by Sir William Thomson (who later became Lord Kelvin). Thomson had previously, during the 1860s, introduced the method of harmonic analysis of tidal patterns. The first machine was designed by Thomson with the collaboration of Edward Roberts (assistant at the UK HM Nautical Almanac Office), and of Alexander Légé, who constructed it.In the US, another tide-predicting machine on a different pattern (shown right) was designed by William Ferrel and built in 1881-2. Developments and improvements continued in the UK, US and Germany through the first half of the 20th century. The machines became widely used for constructing official tidal predictions for general marine navigation. They came to be regarded as of military strategic importance during World War I, and again during the second World War, when the US No.2 Tide Predicting Machine, described below, was classified, along with the data that it produced, and used to predict tides for the D-day Normandy landings and all the island landings in the Pacific war. Military interest in such machines continued even for some time afterwards. They were made obsolete by digital electronic computers that can be programmed to carry out similar computations, but the tide-predicting machines continued in use until the 1960s and 1970s.Several examples of tide-predicting machines remain on display as museum pieces, occasionally put into operation for demonstration purposes, monuments to the mathematical and mechanical ingenuity of their creators.".
• Tide-predicting_machine thumbnail DSCN1739-thomson-tide-machine.jpg?width=300.
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• Tide-predicting_machine wikiPageExternalLink tide-predicter.
• Tide-predicting_machine wikiPageExternalLink doodsonmachine.html.
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• Tide-predicting_machine wikiPageExternalLink oldBrassBrains.pdf.
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• Tide-predicting_machine wikiPageRevisionID "603398194".
• Tide-predicting_machine hasPhotoCollection Tide-predicting_machine.
• Tide-predicting_machine subject Category:Analog_computers.
• Tide-predicting_machine subject Category:Navigation.
• Tide-predicting_machine subject Category:Tides.
• Tide-predicting_machine type AnalogComputer102708224.
• Tide-predicting_machine type AnalogComputers.
• Tide-predicting_machine type Artifact100021939.
• Tide-predicting_machine type Computer103082979.
• Tide-predicting_machine type Device103183080.
• Tide-predicting_machine type Instrumentality103575240.
• Tide-predicting_machine type Machine103699975.
• Tide-predicting_machine type Object100002684.
• Tide-predicting_machine type PhysicalEntity100001930.
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• Tide-predicting_machine comment "A tide-predicting machine was a special-purpose mechanical analog computer of the late 19th and early 20th centuries, constructed and set up to predict the ebb and flow of sea tides and the irregular variations in their heights – which change in mixtures of rhythms, that never (in the aggregate) repeat themselves exactly. Its purpose was to shorten the laborious and error-prone computations of tide-prediction.".
• Tide-predicting_machine label "Gezeitenrechenmaschine".
• Tide-predicting_machine label "Machine à prévoir les marées".
• Tide-predicting_machine label "Tide-predicting machine".
• Tide-predicting_machine sameAs Gezeitenrechenmaschine.
• Tide-predicting_machine sameAs Machine_à_prévoir_les_marées.
• Tide-predicting_machine sameAs m.080l710.
• Tide-predicting_machine sameAs Q387847.
• Tide-predicting_machine sameAs Q387847.
• Tide-predicting_machine sameAs Tide-predicting_machine.
• Tide-predicting_machine wasDerivedFrom Tide-predicting_machine?oldid=603398194.
• Tide-predicting_machine depiction DSCN1739-thomson-tide-machine.jpg.
• Tide-predicting_machine isPrimaryTopicOf Tide-predicting_machine.