Mechanical watch with a mainspring that is wound by the wearers movements via a rotor.
A mechanical watch whose mainspring is wound by the movements of the wearer's arm. Unlike the quartz watch, it requires no battery. The system was invented in Switzerland by Abraham-Louis Perrelet in the 18th Century.
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.
An automatic watch contains a self-winding, mechanical watch movement that is wound by the movement of the wearer. A heavy pivoted rotor turning back and forth transmits its energy to the spring by means of an appropriate mechanism.
an "Automatic movement" needs no battery. The mechanism winds itself by the movement of the watch bearer. Therefore the watch never needs a battery change. An "Automatic" watch typically cost more than a "Quartz" watch. Most watches have matching styles for Quartz & Automatic.
An automatic watch (also called a self-winding watch or, in Rolex movements, "perpetual") is a mechanical watch, typically with a balance wheel escapement, whose mainspring is wound by the motion of the wearer's arm, instead of having to be wound manually every day. Whereas a quartz watch is powered by electricity, a mechanical watch is powered by a mainspring which must be rewound for the watch to keep time.
