File:Watch mainsprings.png

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DescriptionWatch mainsprings.png	English: Photos of pocketwatch mainsprings made by Elgin Watch Co. around 1910, from a service bulletin published by the company. Shows three types (l-r): normal, semi-reverse, reverse. The reverse curves given to the outer portion of the spring in the last two types provided additional torque during the later part of the watch's running period as the spring was running down. This produced a more constant drive force for the watch movement, resulting in greater accuracy. Alterations: cropped out frames and captions, combined 3 separate photos, cloned background of 2nd photo to cover blank areas of composite, converted to PNG
Date	Source states this bulletin was published between 1910 and 1915
Source	Downloaded from Mainsprings, Elgin Service Bureau Bulletin, Elgin National Watch Co., p.6,7, & 18, The Elgin Watch Collector's Site on Nov. 29, 2007
Author	Elgin National Watch Co.
Permission (Reusing this file)	Public domain - published in the US before 1923

Public domain	This media file is in the public domain in the United States. This applies to U.S. works where the copyright has expired, often because its first publication occurred prior to January 1, 1929, and if not then due to lack of notice or renewal. See this page for further explanation.	United States
	This image might not be in the public domain outside of the United States; this especially applies in the countries and areas that do not apply the rule of the shorter term for US works, such as Canada, Mainland China (not Hong Kong or Macao), Germany, Mexico, and Switzerland. The creator and year of publication are essential information and must be provided. See Wikipedia:Public domain and Wikipedia:Copyrights for more details.

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	Date/Time	Thumbnail	Dimensions	User	Comment
current	21:27, 29 November 2007		1,081 × 954 (158 KB)	Chetvorno (talk \| contribs)	{{Information \|Description=Pocketwatch mainsprings made by Elgin Watch Co. \|Source=Downloaded from [http://elginwatches.org/scans/tech_doc/bulletin_mainsprings/m_index.html Mainsprings, Elgin Service Bureau Bulletin, Elgin National Watch Co., p.6,7, & 1

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