A mechanical metronome is a device used by musicians to keep a steady tempo while practicing or performing. It produces a regular ticking sound at adjustable intervals, allowing musicians to maintain consistent timing. The device typically consists of a pendulum that swings back and forth, with a weight that can be moved to change the speed of the ticks. These metronomes are often made of wood or plastic and can be wound up to operate without batteries. They are commonly used in conjunction with musical instruments, such as the piano or guitar, to help improve rhythm and timing skills.