Power source of the clocks.....

provides power to keep the clock going. In mechanical clocks, this is either a weight suspended from a cord wrapped around a pulley, or a spiral spring called a mainspring. In electric clocks, it is either a battery or the AC power line.Since clocks must run continuously, there is often a small secondary power source to keep the clock going temporarily during interruptions in the main power. In old mechanical clocks, a maintaining power spring kept the clock turning while the mainspring wa