During this period he witnessed a Brocken spectre and glory, caused by the sun casting a shadow on a cloud below the observer. He later tried to reproduce these phenomena in the laboratory, which led to his invention of the cloud chamber, used to detect ionising radiation.
The Brocken spectre is a known optical effect, not a ghost. It is included because such giant shadow figures have long been taken for apparitions on mountains. Older folklore of Ben Nevis was not found for this batch.
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