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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. Quartz clock - Wikipedia

   en.wikipedia.org/wiki/Quartz_clock

   The Lavet-type stepping motors used in analog quartz clock movements which themselves are driven by a magnetic field (generated by the coil) can be affected by external (nearby) magnetism sources, and this may impact the rotor sprocket output. As a result, the mechanical output of analog quartz clock movements may temporarily stop, advance or ...

4. 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.

5. Atmos clock - Wikipedia

   en.wikipedia.org/wiki/Atmos_clock

   The first clock powered by changes in atmospheric pressure and temperature was invented by Cornelis Drebbel in the early 17th century. Drebbel built as many as 18 of these, the two most notable being for King James VI & I of Britain, and Rudolf II of Bohemia. The King James clock was known as the Eltham Perpetuum, and was famous throughout Europe.

6. Projection clock - Wikipedia

   en.wikipedia.org/wiki/Projection_clock

   A projection clock (also called ceiling clock) is an analogue or digital clock equipped with a projector that creates an enlarged image of the clock face or display on any surface usable as a projection screen, most often the ceiling. [1] The clock can be placed almost anywhere if only the projected image must be seen.

7. Flip clock - Wikipedia

   en.wikipedia.org/wiki/Flip_clock

   The inset shows the metal tab holding back the top flap. The narrow numbered wheel and knobs on the left are the alarm mechanism. This is a synchronous electric clock which is kept to the correct time by the 50/60 Hz AC power grid. The small hook which retains the hour leaves until the top of the hour can be dimly seen, retracted, in the inset.