It is far more certain that Syracuse went through the usual revolutions of a Greek city.
The principle of seniority, as we know from North Arabian history, gives rise to intrigues and palace revolutions, and was probably often violated in favour of the direct heir.
If, then, we can determine the number m of revolutions performed by the plate in every second, we shall at once have the number of vibrations per second corresponding to the audible note by multiplying m by n.
On the completion of each revolution of this toothed wheel (which, if the number of its teeth be 100, will comprise loo revolutions of the movable plate), a projecting pin fixed to it catches a tooth of another toothed wheel and turns it round, and with it a corresponding index which thus records the number of turns of the first toothed wheel.
The following are worth mention: - Vie politique, militaire et privee du general Moreau (1814); Catastrophe de Murat, ou Recit de la derniere revolution de Naples (1815); Histoire de la guerre d'Espagne et du Portugal, 1807-1813 (2 vols., 1819); Collection de memoires relatifs aux revolutions d'Espagne (2 vols., 1824); Histoire de la revolution de Piemont (2 vols., 1821, 1823); Memoires secrets et inedits pour servir a l'histoire contemporaine (2 vols., 1825).