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1735 'On Tuesday they began to drive the Piles in Rosamond's Pond in St. James's-Park, in order to erect the new-invented Engine by Mr. Hugh Roberts, Native of Flintshire : it is a great Undertaking, and done by Order of her Majesty ; and if it meets with Success, the Canal in the said Park is to be drain'd and clean'd in like Manner. 'Tis said this Engine will cost the Inventor in erecting 350 or 400l, several Loads of Timber being carried into the Park for that Use. When 'tis finish'd he proposes to throw all the Water out of the aforefaid Pond in four Hours Time; and that his Engine will discharge thirty Tons of Water in a Minute, the Inventor having already made a Computation of the Water by gauging the Pond, which has not been cleans'd for near thirty Years before. The Water is be convey'd into the Canal.'