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Excerpt from Philosophical Transactions of the Royal Society of London, for the Year 1881, Vol. 172: Part IIIIT has long been clear that the means placed at our disposal by photography for studying the solar spectrum enable us to construct maps of the region more refrangible than b on a much larger scale than those hitherto employed.At the same time, as our knowledge of

Title : Philosophical Transactions of the Royal Society of London, for the Year 1881, Vol. 172: Part III (Classic Reprint)
Author : Royal Society of London
Language : en
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Uploaded : Apr 13, 2021

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