1) Energy harvesting
Found on
https://www.crosswordclues.com/clue/automatic-watch
An automatic or self-winding watch is a mechanical watch in which the mainspring is wound automatically as a result of natural motion of the wearer`s arm, to provide energy to run the watch, making manual winding unnecessary. A mechanical watch which is neither self-winding nor electrically driven is called a manual watch. Many of the mechanical ....
Found on
http://en.wikipedia.org/wiki/Automatic_watch
No exact match found.
