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Sir, Having received from Mr. le cerf, watch-maker at Geneva, two instruments of his invention, with the annexed paper; and being desired by him to present them to the Royal Society, I take the liberty of sending them to you, as secretary of that learned Body.

philosophical transactions of the royal society of london

XLIII. Account of the advantages of a newly-invented machine much varied in its effects, and very useful for determining the perfect proportion between different moveables acting by levers and wheel and pinion