The clock is an instrument, a device for measuring and displaying the time and used to measure the duration or to an event or process and helps to better planning of individual activities. It is one of the most ancient human inventions. In ancient clocks every hour reproduce a sound signal by a bell or buzzer that repeats many times as you watch. The clock satisfy the natural need of man to measure short intervals.
The size of watches today is different – from alarm clocks, digital watches, wrist watches to watches towers. They are driven by a variety of mechanisms – gravity, springs, and other electricity and regulate various devices, one of which is a pendulum.
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