Jul 1881
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1881natur..24r.260s&link_type=abstract
Nature, Volume 24, Issue 612, pp. 260 (1881).
Physics
Scientific paper
I INCLOSE copies of photographs from two negatives (as you may see by looking at the points stereoscopically) of the Cyclopean gallery at Tiryns, for the sake of calling attention to the optical phenomenon shown in it. The gallery is very dark, the only light entering it by the narrow entrance and crevices between the rocks. At the extreme end of the gallery is an opening to the sky large enough to put one's hand through. In the photograph this is shown as a nucleus by a black speck surrounded by bright light, around which appears a dark circle, which again is encircled by a halo as perfectly rendered as one can see that around the moon at times. The dark nucleus is larger in the negative which had the longest exposure (the irregular lights around are only the light falling on the stones from side openings not visible). There was no such phenomenon recognisable to the naked eye.
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