Rotating Bezel Watches
Another special feature on many watches is a rotating bezel, which enables the wearer to measure elapsed time without having to do any mental arithmetic. At the start of the event to be timed, he turns the bezel so that the zero marker- often a triangular pointer- is aligned with the watch’s minute or seconds hand. When the event ends, he reads the elapsed time off the bezel.
Some rotating bezels are designed for purposes other than time measurement. A rotating slide-rule bezel lets the wearer perform arithmetic calculations. A rotating compass bezel allows the watch to be used as a solar compass.
Divers’ watches nearly always have unidirectional rotating bezels. As the name implies, this type of bezel rotates in only one direction: counterclockwise. That way, if the diver accidentally knocks the bezel while underwater, the watch will err on the safe side - overstating the duration of his dive, not understating it. (A bezel that rotates in either direction is called a bi-directional rotating bezel.)
Here are some examples of rotating bezel watches: Seiko and Mont Blanc Sport watch with rotating bezel.
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