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An orbital ring is a concept for a space elevator that consists of a ring in low Earth orbit that rotates at above orbital speed, that has fixed tethers hanging down to the ground. The structure is intended to be used for very high speed transportation and space launch. The original orbital ring concept is related to the space fountain and launch loop and was explored in detail by Paul Birch and published in three parts in the Journal of the British Interplanetary Society in 1982. ==History== In the 1870s Nikola Tesla, while recovering from malaria, conceived a number of inventions including a ring around the equator, as recounted in his autobiography ''My Inventions'' (1919): The issue was presented by Soviet engineer G. Polyakov in 1977.〔http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19780010146.pdf〕 Arthur C. Clarke's novel ''The Fountains of Paradise'' (1979) is about space elevators, but an appendix mentions the idea of launching objects off the Earth using a structure based on mass drivers. The idea apparently did not work, but this inspired further research. Paul Birch published a series of articles in the Journal of the British Interplanetary Society (JBIS) in 1982. Anatoly E. Yunitsky also published a similar idea in 1982.〔Техника-молодежи» 1982 №6, с.34-36 -"Technical youth" 1982 - http://yunitskiy.com/author/1982/1982_02.pdf 〕 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「orbital ring」の詳細全文を読む スポンサード リンク
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