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George Medhurst (1759–1827) was a mechanical engineer and inventor, who pioneered the use of compressed air as a means of propulsion. His ideas led directly to the development of the first atmospheric railway. He was born in Shoreham, Kent and trained as a clockmaker at Clerkenwell, London, but later became interested in pneumatics. In 1799, he filed a patent for a wind pump for compressing air to obtain motive power and the following year he patented his ‘Aeolian’ engine which used compressed air to power vehicles. In his pamphlet ''On the properties, power, & application of the Aeolian engine, with a plan and particulars for carrying it into execution'', Medhurst proposed the establishment of Aeolian coach services, operated by pumping stations along the route. In 1810, he published ''A new method of conveying letters and goods with great certainty and rapidity by air'',〔(George Medhurst, A New method of conveying letters and goods with great certainty and rapidity by air. London: 1810. )〕 but did not patent the idea. This was followed in 1812 by his ''Calculations and remarks tending to prove the practicability, effects and advantages of a plan for the rapid conveyance of goods and passengers upon an iron road through a tube of 30 feet in area by the power and velocity of air''.〔(George Medhurst, Calculations and remarks tending to prove the practicability ... of a plan for the rapid conveyance of goods and passengers upon an iron road through a tube of 30 feet in area, by the power and velocity of air. London: 1812. )〕 He also envisioned carriages running on rails, propelled by a continuous tube beneath the rails, as would later happened in the atmospheric railway. Neither of these ideas was put into practical operation at the time. Shortly before his death in September 1827 Medhurst returned to the idea of pneumatic propulsion with his publication of ''A New System of Inland Conveyance, for Goods and Passengers ... with the velocity of sixty miles in an hour ... without the aid of horses or any animal power.'' (plates. )〔(George Medhurst, A new system of inland conveyance for goods and passengers ... with the velocity of sixty miles an hour ... without the aid of horses or any animal power. London: 1827 )〕 Other, more successful, inventions by Medhurst included a steam carriage, a ‘leak proof’ canal lock gate and a variety of weighing and balancing machines. ==References== 〔 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「George Medhurst」の詳細全文を読む スポンサード リンク
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