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  2. 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. [2] Chronometers often included other innovations to increase their efficiency and precision.

  3. Hack watch - Wikipedia

    en.wikipedia.org/wiki/Hack_Watch

    The use of a hack watch makes it easier to take sights, as the chronometer is normally in a fixed position in a ship – below decks and suspended in gimbals to keep it level and protect it from the elements, while the hack watch is portable and can be carried on deck. Though not as accurate as the chronometer, the hack watch is accurate enough ...

  4. 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.

  5. Marine chronometer - Wikipedia

    en.wikipedia.org/wiki/Marine_chronometer

    Marine chronometers always contain a maintaining power which keeps the chronometer going while it is being wound, and a power reserve indicator to show how long the chronometer will continue to run without being wound. These technical provisions usually yield timekeeping in mechanical marine chronometers accurate to within 0.5 second per day ...

  6. Ulysse Nardin - Wikipedia

    en.wikipedia.org/wiki/Ulysse_Nardin

    [2] [48] The watch model was named "Watch of the Year" in innovation category in 2002. [1] [2] This use of silicon parts in a mechanical movement was an industry first. [35] [31] In 2005, the brand launched the "Freak Diamond Heart" watch, featuring a patented escapement made from synthetic diamonds. [49]

  7. Omega Marine Chronometer - Wikipedia

    en.wikipedia.org/wiki/Omega_Marine_Chronometer

    OMC calibre 1516. The Omega Marine Chronometer was the first quartz wristwatch ever to be awarded certified status as a marine chronometer.The watch was made by Omega SA and developed by John Othenin-Girard and is one of the most accurate non thermo-compensated production watches ever made, keeping time to within 1 second per month [1]

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