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  2. COSC - Wikipedia

    en.wikipedia.org/wiki/COSC

    This being the case, the totality of the checks (magnetism, operation, and water resistance) guarantees a very high-quality mechanical watch for the end customer. Mechanical watches can be first COSC ISO 3159 "Chronometer" certified and after that METAS N001 "Master Chronometer" certified when all the relevant requirements are met. The first ...

  3. Mechanical watch - Wikipedia

    en.wikipedia.org/wiki/Mechanical_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. Watch timing machine - Wikipedia

    en.wikipedia.org/wiki/Watch_timing_machine

    A watch timing machine or timegrapher is a machine that acoustically measures the ticks of a mechanical watch to assess its accuracy and enable calibration.

  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. Observatory chronometer - Wikipedia

    en.wikipedia.org/wiki/Observatory_Chronometer

    An observatory chronometer is a timepiece that has passed stringent testing and a slate of accuracy tests. Thus, the "observatory trial" developed as the standard process for determining accuracy of timepiece movements. If the chronometer passed the stringent testing, it would be certified. In the world of mechanical timepieces, accuracy is ...

  7. Chronograph - Wikipedia

    en.wikipedia.org/wiki/Chronograph

    Where "Chronograph" refers to the function of a watch, chronometer is a measure of how well a given mechanical timepiece performs: in order to be labeled a chronometer the timepiece must be certified by the COSC, the official Swiss Chronometer testing institute, [20] after undergoing a series of rigorous tests for robustness, accuracy and ...

  8. Chronometer watch - Wikipedia

    en.wikipedia.org/wiki/Chronometer_watch

    A mechanical chronometer is a spring-driven escapement timekeeper, like a watch, but its parts are more massively built. Changes in the elasticity of the balance spring caused by variations in temperature are compensated for by devices built into it.

  9. History of timekeeping devices - Wikipedia

    en.wikipedia.org/wiki/History_of_timekeeping_devices

    The invention resulted in a great advance in the accuracy of the mechanical watch, from around half an hour to within a few minutes per day. [178] Some dispute remains as to whether the balance spring was first invented by Huygens or by Hooke; both scientists claimed to have come up with the idea of the balance spring first.

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