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River Thames frost fairs were held on the tideway of the River Thames at London in some winters between the 17th century and early 19th century, during the period known as the Little Ice Age, when the river froze over. During that time the British winter was more severe than now, and the river was wider and slower, and impeded by Old London Bridge. Even at its peak, in the mid-17th century, the Thames freezing at London was less frequent than modern legend sometimes suggests, never exceeding about one year in ten except for four winters between 1649 and 1666. From 1400 to the removal of the now-replaced medieval London Bridge in 1835, there were 24 winters in which the Thames was recorded to have frozen over at London; if "more or less frozen over" years (in parentheses) are included, the number is 26: 1408, 1435, 1506, 1514, 1537, 1565, 1595, 1608, 1621, 1635, 1649, 1655, 1663, 1666, 1677, 1684, 1695, 1709, 1716, 1740, (1768), 1776, (1785), 1788, 1795, and 1814. So, of the 24, the by-century totals are: 15th 2, 16th 5, 17th 10, 18th 6. Frost fairs were far more common elsewhere in Europe, for example in the Netherlands. The Thames freezes over more often upstream, beyond the reach of the tide, especially above the weirs, of which Teddington Lock is the lowest. The last great freeze of the higher Thames was in 1962-63.〔(Windsor history )〕 During the Great Frost of 1683–84, the worst frost recorded in England, the Thames was completely frozen for two months, with the ice reaching a thickness of 11 inches (28 cm) in London. Solid ice was reported extending for miles off the coasts of the southern North Sea (England, France and the Low Countries), causing severe problems for shipping and preventing the use of many harbours.〔London Gazette, w/c 31 Jan 1684: reports from Dover, 1 Feb〕 Near Manchester, the ground was frozen to 27 inches; in Somerset, to more than four feet. ==Historical background== One of the earliest accounts of the Thames freezing comes from AD 250, when it was frozen solid for nine weeks. As long ago as 923 the river was open to wheeled traffic for trade and the transport of goods for 13 weeks; in 1410, it lasted for 14 weeks. The period from the mid-14th century to the 19th century in Europe is called the ''Little Ice Age'' because of the severity of the climate, especially the winters. In England, when the ice was thick enough and lasted long enough, Londoners would take to the river for travel, trade and entertainment, the latter eventually taking the form of public festivals and fairs. The Thames was broader and shallower in the Middle Ages – it was yet to be embanked, meaning that it flowed more slowly.〔The London Mercury Vol.XIX No.113〕 Moreover, old London Bridge, which carried a row of shops and houses on each side of its roadway, was supported on many closely spaced piers; these were protected by large timber casings which, over the years, were extended – causing a narrowing of the arches below the bridge, thus concentrating the water into swift-flowing torrents. In winter, large pieces of ice would lodge against these timber casings, gradually blocking the arches and acting like a dam for the river at ebb tide. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「River Thames frost fairs」の詳細全文を読む スポンサード リンク
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