Unlike alarm clocks, which repeatedly strike a single bell to mark the passing of a given moment in time, chiming clocks utilize multiple bells or chiming rods to create their brief melodies, which are often set to play at 15-minute intervals. So-called "ting-tang" clocks have just two bells while other antique chiming clocks might have as many as eight, the number needed for a complete musical scale. Musical clocks, which date from as...Continue Reading