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

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1 74[Figure 74]
Etſi uerò foſſores in puteis aut cuniculis res foſſiles diſcreuerunt, tamen
uenæ metallicæ ex ipſis extractæ aut euectæ malleis in partes frangen­
dæ ſunt, uel minutim contundendæ, comminuendæque, ut iſto etiam modo
præſtantiores & meliores partes à uilioribus & deterioribus diſcerni poſ­
ſint: quod in uenis excoquendis plurimum ualet: etenim ſi diſcrimine remo
to uenæ excoquantur, precioſa non raro magnum detrimentum accipit, pri­
uſquam uilis igni liqueſcat: aut una alteram conſumit: quod ne fiat partim
hac diligentia, partim additamentis poſſumus cauere: ſed ſi uena metalli ali­
cuius uilis fuerit, eius extractæ uel euectæ, meliorem partem conijcere opor
tet in unum aliquem locum: deteriorem uerò itemque ſaxa abijcere.
Diſcre­
tores autem cuique abaco durum & latum lapidem imponunt.
Abaci plerunque
longi
& lati quatuor pedes conſtant ex aſſeribus inter ſe coagmentatis: ad
quorum latera & tergum aſſeres, ex eis circiter pedem eminentes, affixi ſunt:
frons, cui ſecretor aſſidet, patet.
Eorum uerò alij uenæ auri uel argenti, diui­
tis maſſam lapidi ſuperimpoſitam & malleo lato, ſed non craſſo, percuſſam
modò in partes frangunt, & in unum uas conijciunt: modò frangunt & præ­
ſtantes à uilioribus diſcernentes, unde nomen inuenerunt, eas ſeparatim in
diuerſa uaſa inijciunt & colligunt.
Alij uerò uenæ minus auri uel argenti di
uitis maſſam item lapidi ſuperimpoſitam, malleoque lato & craſſo percuſſam
minutim contundunt: ac, cùm multa fuerit comminuta, collectam in unum

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