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THis is a way of regulating both standing Watches, and movable Watches, either for the Sea, or the Pocket, which some ten or twelve years since I shewed the Royal Society, when I shewed them my contrivances of the Circu∣lar
Pendulum, which is since published by Monsieur Huge∣nius, which is also mentioned in the History of the said So∣ciety, p. 247. lin. 20. This was by a fly moving Circularly in∣stead of a ballance, whose motion was regulated by weights, flying further and further from the Center according as the strength of the Spring of the Watch had more and more force upon its Arbor. The Weights were regulated from flying out further than they ought to do by the con∣trivance of a Spiral Spring, drawing both the said Weights to the Center of the motion or fly, in the same proportion as I then demonstrated Gravity to attract the weight of a Circular Pendulum, moved in a Parabolical Superficies, towards the Center or Axis of its motion. The Weights were so contrived as always to counterpoise each other. The Skeleton of this fly you have represented in the Figure. The particular explanation of the parts, and the Geometrical Demonstration of the Principle both of the Springs, and of the flying from the Center, I shall explain in the Theory of Springs, and in the de∣scription of Time-keepers and Watches.
〈 in non-Latin alphabet 〉〈 in non-Latin alphabet 〉. Arist. Quaest. Mechan.