File:Steel mill.png
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This is a file from the Wikimedia Commons. The description on its description page there is shown below.
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Summary
| Description |
English: A steel mill or device for illuminating coal mines before safety lamps were habitual. Toothed gearing spun a steel wheel D against which a flint was held. The sparks were sufficient to light the work, and were too small to ignite any explosive gas - usually. From the change in colour of the sparks an experienced operator could tell if the atmosphere was getting dangerous. It was not foolproof, but much safer than the previous form of illumination: lighted candles.
With this tool, areas of mines that had been considered too dangerous to work became exploitable. |
| Date | |
| Source | Matthias Dunn, Treatise on the Winning and Working of Collieries, (2ed, 1862), Dodsworth, Newcastle-Upon-Tyne |
| Author | Matthias Dunn (1788-1869) |
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. This work is in the public domain in the United States because it was published (or registered with the U.S. Copyright Office) before January 1, 1929. |
| This file has been identified as being free of known restrictions under copyright law, including all related and neighboring rights. | |
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| Date/Time | Dimensions | User | Comment | |
|---|---|---|---|---|
| current | 06:28, 17 March 2023 | 1,762 × 895 (203 KB) | Ttocserp | Uploaded a work by Matthias Dunn (1788-1869) from Matthias Dunn, ''Treatise on the Winning and Working of Collieries'', (2ed, 1862), Dodsworth, Newcastle-Upon-Tyne with UploadWizard |
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