Abstract
IF a coal-fire be looked into with some attention after a fresh supply of coals has nearly ceased to give out its gases, there will be seen here and there in the hottest parts, and coming out of them through crannies and round dark corners, a pale translucent yellow flame, which one soon gets to recognise easily. What does it consist of? If looked at through a prism, without any slit screen, this flame is at once seen to he monochromatic. Neither its shape nor brilliancy (in which it is deficient) are at all altered or impaired; and it is especially interesting on this account, as there is something uncanny in the appearance of this pale flame defying the power of the prism, as it flickers aad plays about the brilliant spectrum representing the red-hot coals.
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HERSCHEL, J. Soda Flames in Coal Fires. Nature 27, 78 (1882). https://doi.org/10.1038/027078b0
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DOI: https://doi.org/10.1038/027078b0
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