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  2. Digital clock - Wikipedia

    en.wikipedia.org/wiki/Digital_clock

    Digital clocks typically use the 50 or 60 hertz oscillation of AC power or a 32,768 hertz crystal oscillator as in a quartz clock to keep time. Most digital clocks display the hour of the day in 24-hour format; in the United States and a few other countries, a commonly used hour sequence option is 12-hour format (with some indication of AM or PM).

  3. Clock face - Wikipedia

    en.wikipedia.org/wiki/Clock_face

    '12:14' in both analog and digital representations. In the analog clock, the minute hand is on "14" minutes, and the hour hand is moving from "12" to "1" – this indicates a time of 12:14. A ship's radio room wall clock during the age of wireless telegraphy showing '10:09' and 36 seconds'. The green and red shaded areas denote 3 minute periods ...

  4. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    An analog pendulum clock made around 18th century. A clock or chronometer is a device that measures and displays time.The clock is one of the oldest human inventions, meeting the need to measure intervals of time shorter than the natural units such as the day, the lunar month, and the year.

  5. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    In most clocks, the resonator is in a small cylindrical or flat package, about 4 to 6 mm (0.16 to 0.24 in) long. [6] The 32 768 Hz resonator has become so common due to a compromise between the large physical size of low-frequency crystals for watches and the larger current drain of high-frequency crystals, which reduces the life of the watch ...

  6. Geochron - Wikipedia

    en.wikipedia.org/wiki/Geochron

    Geochron Digital and Mechanical side by side on wall. In 2018, Geochron released an electronic version of its mechanical clock, [ 1 ] optimized for 4K resolution displays. It includes many features that were unavailable prior to the internet , including satellite tracking, and demographic layers above different mapsets.

  7. Flip clock - Wikipedia

    en.wikipedia.org/wiki/Flip_clock

    Many vintage digital clocks with split flap displays cannot be wound back, as the flip mechanism operates only in one direction. Instead they must be either wound forward 23 hours to achieve the effect of winding back 1 hour at the end of daylight saving time or the clock may be stopped (by disconnecting it from power) for 1 hour. However, on ...