File:Watch automatic mainspring.jpg

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Description
English: A mainspring in a Sea-Gull ST16 wristwatch movement. This watch is "automatic" or self-winding, which means that there is an eccentric weight mechanism in the watch which winds the spring using the motion of the owner's wrist. To prevent the mainspring from being overwound, which could result in the mainspring breaking, the spring is attached to the barrel which contains it with an expansion spring "bridle" device. When the watch is fully wound, further winding pulls the end of the mainspring bridle loose and it just slides along the barrel wall, so the mainspring can't be broken by overwinding. This photo is taken through the face of a skeleton watch, as seen in File:Automatic skeleton watch.jpg. A similar spring uncoiled is seen File:Mainspring Chinese uncoiled.jpg
Source Own work
Author Hustvedt

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Date/TimeThumbnailDimensionsUserComment
current19:38, 27 February 2009Thumbnail for version as of 19:38, 27 February 20091,728 × 1,262 (352 KB)Hustvedt{{Information |Description={{en|1=A mainspring on a Sea-Gull ST16 movement, which is an automatic. This is through the face of a skeleton watch.}} |Source=Own work by uploader |Author=Hustvedt |Date= |Permission= |other_versions= }} [[Ca
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