Model. The piledriver was designed by Richard Valoue, a watch-maker, in 1737, and used in the construction of Westminster Bridge the following year. Piles were sunk around the piers of the bridge to protect them from barges. Three horses turned the capstan which lifted the weight which then fell on the pile. A revolving fly prevented the horses from falling when the weight was released. This model is asociated with Dr Stephen Demainbray (1710-82), a science lecturer of the 18th century.
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