Agricola, Georg, De re metallica Libri XII, Quibus Officia, Instrumenta, Machinae, ac omnia ..., 1556

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1 172[Figure 172]
At aurum ab argento hac ratione ſecernitur. Temperatura primum adie
cto plumbo coquatur in catino cinereo uſque dum omne plumbum exhalet,
atque eius bes æris tantummodo drachmas quinque, aut ſummum ſex, in ſe con
tineat
: nam ſi plus æris in ipſa fuerit, argentum ab auro ſeparatum mox rur­
ſus cum eo coniungitur: tale argentum, in quo aurum ineſt, liquatum uel for­
metur in globulos bacillo inferius diffiſſo agitatum, uel in canaliculum fer­
reum infundatur, & ex refrigerato efficiatur tenuis bractea.
Quoniam uerò
ratio faciendi globulos ex auro argentoſo acriorem curam & diligentiam
quàm ex alijs metallis deſiderat, eam nunc paucis exponam: id primò conij
ciendum eſt in catinum: qui deinde operculo tegendus & imponendus eſt
in alterum catinum fictilem, modicum cinerem continentem: tum ita ſunt in
fornace collocandi, ut ignis, flatu follis, inſpirari poſſit.
Poſtea eis carbones
circundandi ſunt: hisque, ne cadant, lapides uel lateres: mox catino ſuperiori
carbones inijciendi ſunt, & eis prunæ ſuperinijciendæ: quibus rurſus carbo
nes, ut catinus undique eis circundetur & contegatur: quem ſinere oportet ſe
mihora, uel paulo longiore ſpacio carbonibus candentibus calefieri: & pro­
uidere, ne deficientibus ijſdem refrigeſcat: poſthæc per follis narem flatus in­
ſpirandus eſt, ut aurum incipiat liqueſcere: mox uerſandum, & experimen­
to rapto conſiderandum an liquatum ſit.
Si fuerit liquatum, additamento ad
ipſum adiecto catinum rurſus confeſtim operculare conuenit, ne id exha­

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