Was musicmaster of Mile, de Guise about 1700. To him belongs the credit of the invention of the metronome. His invention took the minute as the unit and went up to seventy-two degrees of rapidity; but its size, six feet in height, was against its general usefulness. About a century later Maelzel perfected the idea. His principal writings are Elements ou Principes de Musique, at the close ot which is an engraving and description of his cronometre; and his nouveau systeme de musique with explanation of his sonometre.