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  2. 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.

  3. Turret clock - Wikipedia

    en.wikipedia.org/wiki/Turret_clock

    This greatly reduced the energy consumed by the pendulum, and allowed longer pendulums to be used. While domestic pendulum clocks usually use a seconds pendulum 1.0 meter (39 in) long, tower clocks often use a 1.5 second pendulum, 2.25 m (7.4 ft) long, or a two-second pendulum, 4 m (13 ft) long. [1] [2]

  4. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    The French Time Service included pendulum clocks in their ensemble of standard clocks until 1954. [21] The home pendulum clock began to be replaced as domestic timekeeper during the 1930s and 1940s by the synchronous electric clock, which kept more accurate time because it was synchronized to the oscillation of the electric power grid.

  5. Sessions Clock - Wikipedia

    en.wikipedia.org/wiki/Sessions_Clock

    Between 1903 and 1933 Sessions produced 52 models of mechanical clocks, ranging from Advertisers, large and small clocks with logos of various businesses, to wall, or regulator clocks, and shelf or mantel clocks, designed for the home. Many of the Session clocks from this period are prized by collectors. In 1930, the company expanded to produce ...

  6. List of clock manufacturers - Wikipedia

    en.wikipedia.org/wiki/List_of_clock_manufacturers

    Produced Post Office/Official Government Vienna Regulators. Some clocks signed "Kreutz & Bauer in Wein". Gebr. Resch, Ebensee, Austria. Used trademark "REMEMBER". Factory began 1862 in Vienna, moved to Ebensee 1871. Produced up to 15,000 clocks in 1885. Factory sold to Junghans 1901 & renamed "Uhrenfabrik Ebensee Austria". Johann Mold, (c. 1870 ...

  7. 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 ...

  8. Electric clock - Wikipedia

    en.wikipedia.org/wiki/Electric_clock

    The first electric clocks had prominent pendulums because this was a familiar shape and design. Smaller clocks and watches with a spiral-balance are made on the same principles as pendulum clocks. In 1918, Henry Ellis Warren invented the first synchronous electric clock in Ashland, MA, which kept time from the oscillations of the power grid.

  9. Shortt–Synchronome clock - Wikipedia

    en.wikipedia.org/wiki/Shortt–Synchronome_clock

    Shortt clocks kept time with two pendulums, a primary pendulum swinging in a vacuum tank and a secondary pendulum in a separate clock, which was synchronized to the primary by electro-mechanical means. The secondary pendulum was attached to the timekeeping mechanisms of the clock, leaving the primary pendulum virtually free of external ...

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