"Robert Hooke was the first to announce that the force of the spring is as its angular distance from its position of rest. It seems, indeed, from his posthumous works, edited by Waller.... that Hooke, as early as 1656, had under the form of an anagram, expressed the law Ut pondus sic tensio. I have therefore little doubt that to Hooke we owe the invention of the fusee, one of the most beautiful of the many contrivances required to make a perfect timekeeper."