Evaporating Pan: Sheet Lead Folded Up at the Angles (Ure, 1839)

The acid-works evaporator of Ure's day: a rectangular pan made from one large sheet of lead, 12 or 14 lb to the square foot, simply folded up at the angles to a depth of 8 or 10 inches, and set on a grate of strong wrought-iron bars over a furnace. Lead pans stand weak sulphuric acid; Ure takes the acid out at sp. gr. 1.650, or 1.700 at most, because stronger acid begins to eat the lead. Not given: length and breadth. Source: A. Ure, Dictionary of Arts, Manufactures, and Mines (1839), Acid, Sulphuric. Picture: our drawing.