File:Verneuil torch sketch.png
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| Date/Time | Thumbnail | Dimensions | User | Comment | |
|---|---|---|---|---|---|
| current | 13:52, 16 January 2017 | | 1,368 × 1,959 (141 KB) | 127.0.0.1 (talk) | An early sketch of a Verneuil torch, used by Verneuil for the production of rubies using the Verneuil process. Taken from "Synthesis of Precious Stones" by I.H. Levin, first published in May 24, 1912. Available online at |
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