File:Watch mainsprings.png
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Summary
| Description |
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 |
Licensing
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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.
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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 21:27, 29 November 2007 | | 1,081 × 954 (158 KB) | Chetvorno | {{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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