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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.
Utangiye
Unknown
Amabwiriza
1
1
Fold the sheet into a pan
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.
Ibikoresho by'iyi ntambwe:
Urupapuro rw'isasu1 12 or 14 lb per sq ft
Ingano zitazwi1 igiceIbikoresho bikenewe:
Agapimo kagororotse
Inyundo y'Igiti2
2
Set it over the fire
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.
Ibikoresho bikenewe:
Akayunguruzo k'amashyigaIbikoresho
2- 1 12 or 14 lb per sq ftUmwanya
- 1 igiceUmwanya
Ibikoresho bikenewe
3- Umwanya
- Umwanya
- Umwanya
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