Model of Valoué's pile-driver, before 1753
The pile-driver which was invented by James Valoué, a watchmaker, in about 1737, and used in the construction of Westminster Bridge in 1738, was described by Demainbray as 'the best of that kind that perhaps was ever seen'. This model was used by Demainbray in his lecture on compound engines, but unlike a later version given to him by the Marquis de Grollier, it required the use of horses.
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