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A modern LF radio-controlled clock. A radio clock or radio-controlled clock (RCC), and often colloquially (and incorrectly [1]) referred to as an "atomic clock", is a type of quartz clock or watch that is automatically synchronized to a time code transmitted by a radio transmitter connected to a time standard such as an atomic clock.
Video of the rotor turning in an automatic wristwatch having a glass back, when the watch is moved by hand. An automatic watch, also known as a self-winding watch or simply an automatic, is a mechanical watch where the natural motion of the wearer provides energy to wind the mainspring, making manual winding unnecessary if worn enough. [1]
Whereas a mechanically-wound watch must be wound with the pendant or a levered setting, an automatic watch does not need to be wound by the pendant; simply rotating the watch winds the watch automatically. The interior of an automatic watch houses a swiveling metal or brass "plate" that swivels on its axis when the watch is shaken horizontally ...
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Perrelet is thus widely acknowledged as the inventor of the "automatic" watch. However, his watch probably used a weight pivoting at the side of the movement. The first drawing and accurate description of an automatic watch with a central rotor was created in 1778 by the watchmaker Hubert Sarton and that design is attributed to him. Following ...
The Automatic Orthophonic allowed the listener to load a stack of several records into the machine, which would then be automatically played in sequence for a much longer uninterrupted listening time. By the late 1950s, Garrard (of Britain) and Dual (Germany) dominated the high-end record changer market in the United States. [7]
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