A tea kettle was already whistling when they entered, and the maid rushed across the kitchen to grab it.
2 pairs of kettle-drums.
To the bottom, upon coaling the charge, are taken out with a skimmer and discharged into the neighbouring kettle (say to the right) until about two-thirds of the original charge has been removed; then the liquid enriched lead is ladled into the kettle on the opposite side.
To the kettle, two-thirds full of crystals of lead, is now added lead of the same tenor in silver, the whole is liquefied, and the cooling, crystallizing, skimming and ladling are repeated.
In the process the yield in metal, based upon the charge in the kettle, is lead 99%, silver loo-}- %, gold 98-100%.