The Engineer's and Mechanics Encyclopædia: Orpiment.

The Engineer's and Mechanics Encyclopædia,
comprehending practical illustrations of the machinery and processes employed in every description of manufacture of the British Empire.
With nearly Two Thousand Engravings.
By Luke Hebert, civil engineer, edifor of the History and Progress of the Steam Engines, Register of Arts and Journal of Patent Inventions, etc.
In two volumes.
London: Thomas Kelly, 17, Paternoster Row.
A mineral substance, consisting of arsenic combined with about forty-three parts of sulphur, and is about thrice as heavy as water. It is found, both in a massive and crystallized state, in Turkey, Hungary, and some other countries. The orpiment of commerce is an artificial production, chiefly imported from different parts of the Levant. A beautiful, but fugitive pigment, called king's gellow, is prepared from this mineral. (See PAINTING.)

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