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(詳細はanalytical and pneumatic chemistry in the eighteenth century. The manufacturing process for "synthetic fuel gases" (also known as "manufactured fuel gas", "manufactured gas" or simply "gas") typically consisted of the gasification of combustible materials, usually coal, but also wood and oil. The coal was gasified by heating the coal in enclosed ovens with an oxygen-poor atmosphere. The fuel gases generated were mixtures of many chemical substances, including hydrogen, methane, carbon monoxide and ethylene, and could be burnt for heating and lighting purposes. Coal gas, for example, also contains significant quantities of unwanted sulfur and ammonia compounds, as well as heavy hydrocarbons, and so the manufactured fuel gases needed to be purified before they could be used. The first attempts to manufacture fuel gas in a commercial way were made in the period 1795–1805 in France by Philippe Lebon, and in England by William Murdoch. Although precursors can be found, it was these two engineers who elaborated the technology with commercial applications in mind. Frederick Winsor was the key player behind the creation of the first gas utility, the London-based Gas Light and Coke Company, incorporated by royal charter in April 1812. Many other manufactured fuel gas utilities were founded first in England, and then in the rest of Europe and North America in the 1820s. The technology increased in scale. After a period of competition, the business model of the gas industry matured in monopolies, where a single company provided gas in a given zone. The ownership of the companies varied from outright municipal ownership, such as in Manchester, to completely private corporations, such as in London and most North American cities. Gas companies thrived during most of the nineteenth century, usually returning good profits to their shareholders, but were also the subject of many complaints over price. In the second half of the 19th century, the manufactured fuel gas industry diversified out of lighting and into heat and cooking. The threat from electrical light in the later 1870s and 1880s drove this trend strongly. The gas industry did not cede the gas lighting market to electricity immediately, as the invention of the Welsbach mantle in the late 1880s dramatically increased the luminosity of gas flames, and gas remained competitive with electricity. Acetylene was also used from about 1898 for gas cooking and gas lighting (see Carbide lamp) on a smaller scale, although its use too declined with the advent of electric lighting, and LPG for cooking.〔(【引用サイトリンク】publisher=www.cganet.com )〕 Other technological developments in the late nineteenth century include the use of water gas and machine stoking, although these were not universally adopted. In the 1890s, pipelines from natural gas fields in Texas and Oklahoma were built to Chicago and other cities, and natural gas was used to supplement manufactured fuel gas supplies, eventually completely displacing it. Gas ceased to be manufactured in North America by 1966 (with the exception of Indianapolis and Honolulu), while it continued in Europe until the 1980s. "Manufactured gas" is again being evaluated as a fuel source, as energy utilities look towards coal gasification once again as a potentially cleaner way of generating power from coal, although nowadays such gases are likely to be called "synthetic natural gas". == Early history of manufactured gas == 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 manufactured gas」の詳細全文を読む スポンサード リンク
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