File:Hydrometer.png
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Hydrometer from Practical Physics, publ. 1914 by Macmillan and Company - now in the public domain under US copyright law since it was published before 1923. This particular scan of the image came from Wikipedia.
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 04:47, 2 July 2006 |  | 130 × 322 (18 KB) | BrewWiki (talk | contribs) | Hydrometer from Practical Physics, publ. 1914 by Macmillan and Company - now in the public domain under US copyright law since it was published before 1923. |
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