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Mechanical watches. Mechanical vibration system of the time equipment, such as the pendulum clock, pendulum clock, such as round. Its working principle is to use a constant cycle, continuous vibration of the vibration system; the vibration when the vibration of the vibration cycle, multiplied by the number, it means that the elapsed time, time = × vibration frequency of the vibration cycle.

Electronic watches. Basic electronic components by the composition. The working principle of electronic watches and clocks are based on "Electro magnetic, magnetic-generated" design from the physical phenomena. That is converted to energy by the electricity, and then by the magnetic energy is converted to mechanical energy, drive around the needle running time to achieve the purpose.
Round table before transistors. Is the dry-cell batteries for the energy, using transistors as switches, for the balance wheel oscillation system gossamer.

Quartz watches. Is a "crystal" as the oscillator frequency to the electronic control of motor operation, driven pointer and take high accuracy.