Fire rainbows, a phenomenon that captivates both the eye and the imagination, are a rare sight in the sky. When these ...

He studied the flora and fauna and ice and snowflake formations under ... He made a detail study of refraction both in the Arctic seas and in the North Sea, surveyed and mapped the East Coast ...

When suitably cut and mounted between glass cover-slips, naphthalene crystals exhibit the phenomena of conical refraction in a very striking way, and enable their features to be critically examined.