Note 37 — A CYCLOPÆDIA OF PRACTICAL RECEIPTS, PROCESSES, AND COLLATERAL INFORMATION (continued 6)
Reading edition
The respective quantities required to produce 100 parts of alum from the sulphate of alumina liquor are—
Chloride ofpotassium15·7
Sulphate of”18·4
”ammonium13·9
In practice, the exact quantity required may be found by a previous trial of a little of the aluminous liquor; but the indications mentioned in the text will always show the operator when a sufficient dose is added.