Image:Verneuil torch sketch.png

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[edit] Summary

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 [1].

[edit] Licensing

 This image is in the public domain in the United States. In most cases, this means that its first publication was in the United States prior to January 1, 1923 or that its copyright expired in the United States.
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