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Revolving Sand-screen

See RIDDLES.

Rhodium is one of the rare metals of the platinum group. Excepting iridium, it is the most infusible metal, very hard and brittle, and of a whitish color. When this metal is alloyed with copper, bismuth, or platinum, it may be dissolved with them in aqua regia, but it is insoluble in acids when pure. Owing to its unalterable nature, rhodium has been extensively used to form the nibs of metallic pens and other similar purposes. See PLATINUM.