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2. Mechanical watch - Wikipedia

   en.wikipedia.org/wiki/Mechanical_watch

   Mechanical watches evolved in Europe in the 17th century from spring powered clocks, which appeared in the 15th century. Mechanical watches are typically not as accurate as quartz watches, [1] [2] [3] and they eventually require periodic cleaning, lubrication and calibration by a skilled watchmaker. [3]

3. 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 ...

4. 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.

5. 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 ...

6. 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.

7. These Automatic Watches Are Low Maintenance, and Loaded ... - AOL

   www.aol.com/lifestyle/automatic-watches-low...

   We tested 30 automatic watches to find the best ones for every wrist and budget. Powered by the energy of your own body, automatic watches provide a mechanical beauty in our digital world.