File:Pyrometer example.png
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Pyrometer_example.png (349 × 256 pixels, file size: 22 KB, MIME type: image/png)
Summary
| Description |
English: Early pyrometer measuring the coefficient of expansion of a metal bar, from a 19th century chemistry textbook The metal bar (a) expands when heated by the lamps (f) and presses against a lever (b), which moves a pointer (c) along a scale that serves as a measuring index. (e) is an immovable prop which holds the bar in place. A spring on (c) pushes against (b), causing the index to fall back once the bar cools. |
| Date | |
| Source | A Textbook on Chemistry, 1852 |
| Author | John Draper |
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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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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File history
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 02:20, 23 August 2013 | | 349 × 256 (22 KB) | wikimediacommons>J1812 | User created page with UploadWizard |
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