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  2. Automatic watch - Wikipedia

    en.wikipedia.org/wiki/Automatic_watch

    The Rolex Watch Company improved Harwood's design in 1930 and used it as the basis for the Shants Company, in which the centrally mounted semi-circular weight could rotate through a full 360° rather than the about 200° of the 'bumper' winder. Rolex's version also increased the amount of energy stored in the mainspring, allowing it to run ...

  3. Mechanical watch - Wikipedia

    en.wikipedia.org/wiki/Mechanical_watch

    The hand-winding movement of a Russian watch. A mechanical watch is a watch that uses a clockwork mechanism to measure the passage of time, as opposed to quartz watches which function using the vibration modes of a piezoelectric quartz tuning fork, or radio watches, which are quartz watches synchronized to an atomic clock via radio waves.

  4. Mainspring - Wikipedia

    en.wikipedia.org/wiki/Mainspring

    Watch movements require regular cleaning and lubrication, and the normal result of neglecting to get a watch cleaned is a watch stopped at full wind. As the watch movement collects dirt and the oil dries up, friction increases, so that the mainspring doesn't have the force to turn the watch at the end of its normal running period, and it stops ...

  5. Tourbillon - Wikipedia

    en.wikipedia.org/wiki/Tourbillon

    In modern mechanical watch designs, production of a highly accurate watch does not require a tourbillon. There is even debate among horologists as to whether tourbillons ever improved the accuracy of mechanical watches, even when first introduced, or whether the watches of the day were inherently inaccurate due to design and manufacturing ...

  6. Balance wheel - Wikipedia

    en.wikipedia.org/wiki/Balance_wheel

    A balance wheel, or balance, is the timekeeping device used in mechanical watches and small clocks, analogous to the pendulum in a pendulum clock.It is a weighted wheel that rotates back and forth, being returned toward its center position by a spiral torsion spring, known as the balance spring or hairspring.

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