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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. Riefler escapement - Wikipedia

    en.wikipedia.org/wiki/Riefler_escapement

    The upper end of the suspension spring is not attached to a fixed support as in most clocks, but instead is attached to a heavy metal bearer, which pivots on two aligned knife-edges on its underside which rest on flat agate plates. The bending point of the suspension spring is in alignment with the line of contact of the knife-edges.

  4. Pendulum clock - Wikipedia

    en.wikipedia.org/wiki/Pendulum_clock

    Also called torsion-spring pendulum, this is a wheel-like mass (most often four spheres on cross spokes) suspended from a vertical strip (ribbon) of spring steel, used as the regulating mechanism in torsion pendulum clocks. Rotation of the mass winds and unwinds the suspension spring, with the energy impulse applied to the top of the spring.

  5. Escapement - Wikipedia

    en.wikipedia.org/wiki/Escapement

    In spring-driven clocks and watches, it required a fusee to even out the force of the mainspring. It was used in the first pendulum clocks for about 50 years after the pendulum clock was invented in 1656. In a pendulum clock, the crown wheel and staff were oriented so they were horizontal, and the pendulum was hung from the staff.

  6. Verge escapement - Wikipedia

    en.wikipedia.org/wiki/Verge_escapement

    All verge watches and spring driven clocks required fusees to equalize the force of the mainspring to achieve even minimal accuracy. The escapement has " recoil ", meaning that the momentum of the foliot or pendulum pushes the crown wheel backward momentarily, causing the clock's wheel train to move backward, during part of its cycle.

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