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  2. Torsion pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Torsion_pendulum_clock

    A torsion pendulum clock, more commonly known as an anniversary clock or 400-day clock, is a mechanical clock which keeps time with a mechanism called a torsion pendulum. This is a weighted disk or wheel, often a decorative wheel with three or four chrome balls on ornate spokes, suspended by a thin wire or ribbon called a torsion spring (also ...

  3. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    A torsion pendulum clock requiring only annual winding is sometimes called a "400-Day clock" or "anniversary clock", sometimes given as a wedding gift. Torsion pendulums are also used in "perpetual" clocks which do not need winding, as their mainspring is kept wound by changes in atmospheric temperature and pressure with a bellows arrangement.

  4. Foucault pendulum - Wikipedia

    en.wikipedia.org/wiki/Foucault_pendulum

    The Foucault pendulum or Foucault's pendulum is a simple device named after French physicist Léon Foucault, conceived as an experiment to demonstrate the Earth's rotation. If a long and heavy pendulum suspended from the high roof above a circular area is monitored over an extended period of time, its plane of oscillation appears to change ...

  5. Atmos clock - Wikipedia

    en.wikipedia.org/wiki/Atmos_clock

    The torsion pendulum has a period of precisely one minute; thirty seconds to rotate in one direction and thirty seconds to return to the starting position. This is thirty times slower than the 0.994 m (39.1 in) seconds pendulum typically found in a longcase clock, where each swing (or half-period) takes one second.

  6. The 50 best Christmas gifts for everyone on your list this year

    www.aol.com/lifestyle/50-best-christmas-gifts-of...

    America's Test Kitchen 25th Anniversary Cookbook. $32 at Amazon. Best Advent calendar 2024 Onyx Coffee Advent Calendar ... they'll be overwhelmed with pride as they watch a DJ octopus spin tracks ...

  7. List of clock manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_clock_manufacturers

    The following is a list of notable companies that produced, or currently produce clocks. Where known, the location of the company and the dates of clock manufacture follow the name. In some instances the "company" consisted of a single person.

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