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1874 -- On Extraordinary Developments of Light in the Grinding of Hard Stones (The Philosophical Magazine and Journal of Science)


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It took this article to inspire me to bang two handmade agates together in the dark. I was quite delighted by the repeatable results: an orange spark.

Apparently on the massive red sandstone grinding wheels of Idar-Oberstein, due to the intense speed and friction, this sparking becomes something of a fireworks show as the agates "become throughout splendidly luminous with red light and at the same time transparent."

 

1874-The-Philosophical-Magazine-Light-In-The-Grinding-Stones.pdf

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Interesting ... that you did it.  

 

And that this 79-year-old man thought it was interesting enough to study and write an article about and encourage further study of. 

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His description of cracking and fragmenting grinding stones is pretty harrowing. I hadn't thought about that before but I sure wouldn't want to anywhere around when it happened - yikes!

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