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  2. Telechron - Wikipedia

    en.wikipedia.org/wiki/Telechron

    The electric clock market grew rapidly in the 1930s, and Telechron's patented power interruption indicator gave his clocks an advantage over competing synchronous clocks, but by the 1950s battery-operated clocks that weren't dependent on the power grid took market share, and in the 1960s the quartz clock replaced synchronous clocks.

  3. Clock - Wikipedia

    en.wikipedia.org/wiki/Clock

    Some clocks, usually digital ones, include an optical projector that shines a magnified image of the time display onto a screen or onto a surface such as an indoor ceiling or wall. The digits are large enough to be easily read, without using glasses, by persons with moderately imperfect vision, so the clocks are convenient for use in their ...

  4. 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).

  5. Electric clock - Wikipedia

    en.wikipedia.org/wiki/Electric_clock

    These keep time by counting the oscillations of a calibrated tuning fork with a specific frequency. These were only made in battery-powered form. Battery-powered clocks have been made using the schemes above with the obvious exception of a synchronous movement. All battery-powered clocks have been largely replaced by the lower cost quartz movement.

  6. Kit-Cat Klock - Wikipedia

    en.wikipedia.org/wiki/Kit-Cat_Klock

    An original model clock with packaging from the 1940s A newer black model clock displays four paws. The Kit-Cat Klock is an art deco novelty wall clock shaped like a grinning cat with cartoon eyes that swivel in time with its pendulum tail. It is traditionally black, but models in other colors and styles are also available.

  7. Quartz clock - Wikipedia

    en.wikipedia.org/wiki/Quartz_clock

    A power of 2 is chosen so a simple chain of digital divide-by-2 stages can derive the 1 Hz signal needed to drive the watch's second hand. 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]

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