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Macneill's road indicator : ウィキペディア英語版 | Macneill's road indicator
Macnaill's Road Indicator was a dynamometer for ascertaining the force necessary to draw a carriage over different kind of roads and pavements. It was developed by John Benjamin Macneill in the late 1820s. == Prototype == Macneill's road indicator was completed according to drawings laid before and authorised by the Parliamentary Commissioners in 1829. It was first used on the road between London and Shrewsbury. A description of and the method of using it was included the Sevent report of the Commissioners(1830).〔(Seventh Report of the Commissioners for the further improvement of the road from London to Holyhead and from London to Liverpool, 13 July 1830 )〕
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