Photographing the Aurora Borealis

Physics

Scientific paper

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Scientific paper

I SHOULD be obliged if I might be permitted to state, with reference to the negative of the aurora borealis obtained by Mr. Tromholt in Christiania on March 15 (NATURE, vol. xxxi. p. 479)-the first ever obtained-that he now informs me that, although the plate was exposed for eight and a half minutes, the said impression is so faint and imperfect that it cannot be reproducel as a positive. My object in asking to be allowed to mention this important fact is to show that the opinion expressed by Mr. Tromholt in his work just published, ``Under the Rays of the Aurora Borealis,'' that it is almost impossible to photograph the aurora borealis on account of the small strength of light and its limited chemical action, may be said still to hold good in the main.

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