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

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1
At auri ramenta retinent areæ uel tegumentis nudæ, uel tectæ: ſi nudæ, in
earum cauis reſident: ſi tectæ, tegumentis adhæreſcunt.
Caua fiunt uarijs mo
dis: aut enim filis ferreis uel tabellis tranſuerſis ad aream affixis, aut non pe­
netrantibus foraminibus, uel rotundis in ipſa eiuſué capite cauatis, uel qua­
drangulis, uel tranſuerſis.
Teguntur uerò areæ pellibus aut pannis, aut ceſpi­
tibus: quas ſingulas ordine perſequar.
Ad aſſeris, longi pedes ſex, lati unum
& quadrantem, latera lotor item affigit eminentes tabellas, ne arena, in qua
auri ramenta inſunt, de eis delabatur: Deinde multa fila ferrea, digitum tranſ­
uerſum inter ſe diſtantia, decuſſat, & qua committuntur aſſeri ſupino clauis fer
reis affigit: tum caput altius facit: in hoc arenas lauandas conijcit, & anſas, quas
area ad caput habet, manibus prehendens eam aliquoties in flumine uel ri­
uo ducit & reducit: quo modo lapilli & glareæ per aream deuoluuntur, are
næ, cum auri ramentis miſtæ, in eius cauis, quæ inter fila ſunt, remanent: quas ex­
cuſſas & in unum locum collectas in alueo lauat: atque ſic auri ramenta facit pura.
Aſſer A. Tabellæ B. Fila ferrea C. Anſæ D.
113[Figure 113]
Alij, in quorum numero ſunt Luſitani, lateribus areæ itidem longæ circi
ter pedes ſex, latæ ſeſquipedem affigunt eminentes tabellas, ſed ſupinæ plu
res tranſuerſas, digitum tranſuerſum inter ſe diſtantes.
Lotor autem uel eius
uxor, aquam in areæ caput immittit: arenam, in qua auri ramenta inſunt, in
idem inijcit: defluentem rutro ligneo, quod tranſuerſum locat in tabellis, agitat: id,

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