Soubor:Watch movement.png

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Fotografie + Description: Drawing of a pocketwatch movement from the early 1900s, with the upper plate removed to show the parts. The numbered parts are identified in the caption as: 1.First or main wheel to which mainspring is attached 2.Second or center wheel 3.Third wheel 4. Fourth wheel 5.Escape wheel 6.Pallet, with pallet jewels 7.Lever 8.Balance 9.Hairspring 10.Roller. Alterations: removed frame and caption, sharpened.

• Date: 1919
• Source: Downloaded 2007-11-30 from Harry Chase Brearley (1919) Time Telling through the Ages, Doubleday, Page & Co., New York, p.232 on Google Books
• Author: Harry Chase Brearley

+ pochází z Wikimedia Commons, kde má status – 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, 1923.

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