A Curious Optical Phenomenon.
The recent observations of Professor Tyndall are interesting m the extreme. On opening the door of his cottage m the Alps on the evening of the 27th September last, he observed his shadow, thrown by a small lamp on the wall behind, projected on the fog outside, and round his head a luminous circle or halo, without color, which proved to be an artificial rainbow. This he succeeded m reproducing by means of a copper boiler, from which steam was let out into the cold air to form a fog, and the light of the lamp behind the head to replace the sun. With an electric light the circular bow was very distinct and showed signs of color, its outer circumference being red and its inner bine. Moreover, the corresponding secondary bow was seen beyond it, with its colors reversed. To those who may wish to make the experiment m an inexpensive way, Dr. Tyndall recommends a spray of spirits of turpentine and petroleum.
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https://paperspast.natlib.govt.nz/newspapers/MS18841011.2.21.6.3
Bibliographic details
Manawatu Standard, Volume IV, Issue 270, 11 October 1884, Page 5 (Supplement)
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168A Curious Optical Phenomenon. Manawatu Standard, Volume IV, Issue 270, 11 October 1884, Page 5 (Supplement)
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