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.

مبتدئ

Unknown

التعليمات

Fold the sheet into a pan

Take a large sheet of lead weighing 12 or 14 lb to the square foot. Simply fold it up at the angles into a rectangular pan 8 or 10 inches deep. Ours: a straightedge and a mallet for the folds.

المواد لهذه الخطوة:

صفيحة رصاص1 12 or 14 lb per sq ft

أبعاد غير معروفة1 قطعة

الأدوات المطلوبة:

مسطرة استقامة

مطرقة خشبية

Set it over the fire

Rest the pan on a grate of a close row of strong wrought-iron bars, with the furnace flame playing underneath. Do not concentrate sulphuric acid in it beyond sp. gr. 1.700: stronger acid begins to corrode the lead.

الأدوات المطلوبة: