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Cultures from pre-history to modern times constructed domed dwellings using local materials. Although it is not known when or where the first dome was created, sporadic examples of early domed structures have been discovered. Brick domes from the ancient Near East and corbelled stone domes have been found from the Middle East to Western Europe. These may indicate a common source or multiple independent traditions. A variety of materials have been used, including wood, mudbrick, or fabric. Indigenous peoples around the world produce similar structures today. == Early and indigenous domes == The earliest domes were likely domed huts made from saplings, reeds, or timbers and covered with thatch, turf, or skins. Materials may have transitioned to rammed earth, mud-brick, or more durable stone as a result of local conditions. The earliest discovered remains of domed constructions may be four small dwellings made of Mammoth tusks and bones. The first was found by a farmer in Mezhirich, Ukraine, in 1965 while he was digging in his cellar and archaeologists unearthed three more. They date from 19,280 - 11,700 BC. More recently, semi-subterranean dwellings of the Thule people, ancestors of the Inuit who were established in the Canadian Arctic by 1300 AD, were made of whalebone frames lashed together with hide straps in a parabolic dome shape covered with hides and blocks of sod and snow. In modern times, the creation of relatively simple dome-like structures has been documented among various indigenous peoples around the world. The wigwam was made by Native Americans using arched branches or poles covered with grass or hides. The Efé people of central Africa construct similar structures, using leaves as shingles. Another example is the igloo, a shelter built from blocks of compact snow and used by the Inuit people, among others. The Himba people of Namibia construct "desert igloos" of wattle and daub for use as temporary shelters at seasonal cattle camps, and as permanent homes by the poor. Extraordinarily thin domes of sun-baked clay 20 feet in diameter, 30 feet high, and nearly parabolic in curve, are known from Cameroon. The examples of beehive domes at Harran, Turkey, have been dated to the 19th century AD, and are similar to the trullos of Italy. Experimental rammed earth domes were made as part of work on sustainable architecture at the University of Kassel in 1983. In developing countries, domes are often less expensive alternatives to flat or sloped-roofed construction because they use less material to enclose a given volume and provide a lower rate of heat transfer due to the reduced surface area. Domes made with loam are found in Europe, Asia, and Africa, almost always using mud-bricks or adobes. A way of building them without centering called the Persian dome technique has been used for centuries in Afghanistan. The historical development from structures like these to more sophisticated domes is not well documented. That the dome was known to early Mesopotamia may explain the existence of domes in both China and the West in the first millennium BC. Another explanation, however, is that the use of the dome shape in construction did not have a single point of origin and was common in virtually all cultures long before domes were constructed with enduring materials. 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「History of early and simple domes」の詳細全文を読む スポンサード リンク
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