A mechanically powered watch that is wound by the motion of the wearer's arm rather than through turning the winding stem (manual mechanical). In response to this motion, a rotor turns and winds the watch's mainspring. If an automatic watch is not worn for a day or two, it will run down and need to be wound by hand to get it started again.
A rotating weight (rotor) which is set into motion by the arm of the wearer. The motion causes this weight to wind the main-spring barrel in a mechanical watch, thereby keeping the watch wound when worn on the wrist. Automatic winding can occur uni-directionally (meaning the weight only winds the watch in one direction) or bi-directional winding (meaning the rotor will wind the watch regardless of which direction it spins).
(also called "self-winding") Winding that occurs through the motion of the wearer's arm rather than through turning the winding stem. It works by means of a rotor that turns in response to motion, thereby winding up the watch's mainspring. An automatic watch that is not worn for a day or two will wind down and need to be wound by hand to get it started again.
This term refers to a watch with a mechanical movement (as opposed to a quartz or electrical movement). The watch is wound by the motion of the wearer's arm rather than through turning the winding stem. A rotor that turns in response to motion winds the watch's mainspring. If an automatic watch is not worn for a day or two, it will wind down and need to be wound by hand to get it started again.
Winding that occurs due to the motion of the wearer's arm rather than due to turning the winding stem. It works by means of a rotor that turns in response to motion, therein winding up the watch's mainspring. An automatic watch that is not worn for a period of time will drain the power reserve and the watch will wind down.
A watch that winds on its own. - A watch whose mainspring is wound by the movements or accelerations of the wearer's arm. On the basis of the principle of terrestrial attraction, a rotor turns and transmits its energy to the spring by means of an appropriate mechanism. The system was invented in Switzerland by Abraham-Louis Perrelet in the 18th century.