Curious Shadow Effects

Abstract

THE staff of the Ben Nevis Observatory have had frequent opportunities of observing the coloured shadows formed round shadows thrown on mist or fog-banks; notes descriptive of these “glories,” as we termed them, with measurements of their diameter, will be found in the extracts from the log-book printed with the other Ben Nevis observations (see Transactions Royal Society Edinburgh, vols. xxxiv. and xlii.). In each ring of these glories the red of the spectrum colours was outside and the blue inside, as in the primary rainbow, and as many as five successive rings of colours have been observed.