File:Balance Wheel in Early Watch Berthoud.png
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Summary
| Description | Illustration of a balance wheel in an early watch, by Ferdinand Berthoud. Alterations: Detail cropped from drawing showing entire watch disassembled. |
| Date | published 1805 |
| Source | Downloaded from Ferdinand Berthoud (1805), L'art de Conduire et de Regler les Pundules et les Montres, J.M. Eberhardt, Paris, Plate 2e on Google Books |
| Author | Ferdinand Berthoud |
| Permission (Reusing this file) |
Public domain: the author died in 1807. |
Licensing
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This work is in the public domain in its country of origin and other countries and areas where the copyright term is the author's life plus 70 years or fewer.  You must also include a United States public domain tag to indicate why this work is in the public domain in the United States.
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| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 12:14, 6 July 2007 | | 464 × 366 (37 KB) | Chetvorno | {{Information |Description=Illustration of a balance wheel in an early watch, by a master watchmaker of the 19th century. From Ferdinand Berthoud (1811), ''L'art de Conduire et de Regler les Pundules et les Montres'' |Source=http://books.google.com/book |
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