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Harwood self-winding watch. In 1923, supported by a local businessman, he developed a self-winding wristwatch and applied for a patent in Switzerland, which was granted in September, 1924. His design ensured that the watch could be hermetically sealed against the ingress of water or dust. The hands could be reset by a rotating bezel.
It featured a rotating bezel marked to 60 minutes, which can be used to measure time intervals. Datejust watches of this type have been nicknamed "Thunderbirds". This watch would form the basis for the Rolex Explorer (designed for Sir Edmund Hillary's Mount Everest expedition), the Rolex Submariner, and the Rolex Sea-Dweller. [2]
Tachymeter scale on a Citizen watch bezel. A tachymeter (pronounced / t æ ˈ k ɪ m É™ t É™r /) is a scale sometimes inscribed around the rim of an analog watch with a chronograph.It can be used to conveniently compute the frequency in inverse-hours of an event of a known second-defined period, such as speed (distance over hours) based on travel time (distance over speed), or measure distance ...
Excel-O-Graph: pilot's navigational chronograph with rotating slide rule bezel, introduced in 1960; Flight Officer (a.k.a. Flying Officer in United Kingdom): pilot's wrist chronograph with world time zone calculator, introduced in 1939; Marathon Navigator: water resistant antimagnetic pilot's watch with rotating 12-hour bezel, introduced in 1984
Originally known as the "Flight Officer", a rank in the early Army Air Forces, [1] the watch's unique rotating 12-hour bezel and 23 cities printed on the periphery of the dial (face) made it possible to calculate changes in the time as a pilot flew across lines of longitude. [2]
In 2009, Oris introduced the Rotation Safety System, a device that locks the uni-directional rotating bezel of a diving watch into place, preventing accidental adjustment underwater. [34] Oris patented the Oris Aquis Depth Gauge, its first mechanical depth gauge, in 2013. It allows water into a channel via a small hole at 12 o’clock.
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