A White Rainbow.
The very rare phenomenon of a whiia rainbow, or ccrcla d'Ulloa, was seen at Courtenay (Loiret), Franca, on the morning of the 28th November, 1883, by M. Cornu, the well-known astronomer. The sun rose in 1 the midst of level bands of cloud, and was very pale in hue. A thick hoar-frost covered the ground, and a light fog formed a thin veil through which the sky was visible, free oi clouds at the zenith, but clouded at the south-east. Opposite the sun a great white arc, or rainbow without color, was pictured on the fog, and recalled to M. Cornu the smoke crowns made with pbosphuretted hydrogen gas. The apparent height from the summit of the arc to the horizon was 23 deg. 26 mm.; the apparent amplitude, or span, 80 deg. ; and the apparent height of the aun at the time (9.41 a.nV. Paria time) was 17 deg. 84 mm.
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https://paperspast.natlib.govt.nz/newspapers/WT18840913.2.46
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Waikato Times, Volume XXIII, Issue 1902, 13 September 1884, Page 5
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155A White Rainbow. Waikato Times, Volume XXIII, Issue 1902, 13 September 1884, Page 5
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