The Engineer's and Mechanics Encyclopædia: Pearl-White.

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.
An oxide of bismuth. It is employed as a cosmetic, to whiten the skin; but its tendency to become black, by exposure to the action of sulphuretted hydrogen mixed with the atmosphere, renders it a very dangerous expedient to heighten female charms.

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