Thursday, September 16, 2010
11:39 AM James Manuel 1 comment
The now common wristwatch is a relative newcomer. It became common in the late 1800’s, particularly among women. During the first world war, artillery officers found that a watch worn on the wrist was more practical than one carried in a pocket. Thereafter, the popularity of wristwatches grew.
Nowadays, most watches are electronic and utilize quartz crystals. When specially shaped and placed in a suitable electronic circuit, a piece of quartz vibrates at a constant frequency, acting like a rapidly swinging pendulum.
It is extremely difficult to adjust mechanical or quartz watches to keep exact time. So no matter what watch you have, it will to some extent gain or lose time. Today, however, quartz watches are available that periodically correct themselves using time signals from atomic clocks. Advertisers claim that such radio-controlled watches are accurate to one second in a million years!
SOME NOTEWORTHY WRISTWATCHES
The first documented wristwatch, Abraham-Louis Breguet
The date is displayed on the watch face, Rolex
An electric-motor wristwatch, Hamilton Watch Company
The time is kept through electronics, Bulova
An all-electronic wristwatch with a digital display, Hamilton Watch Company