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

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1 96[Figure 96]
Canalis uerò deuexus, quod ad aſſeres attinet, reliquis duobus diſſimilis
non eſt: eius etiam, ut aliorum, caput primò terra completur, pilisque tunditur: dein­
de
aſſere tegitur: tum rurſus, qua oportet, terra iniecta iterum tunditur ut nulla
rima
remaneat, per quam aqua cum ramentis metallorum miſta in ipſum penetra
re
poſſit: recta enim defluere debet in canalem deuexum, longum ad pedes octo,
latum ad ſeſquipedem: cum eo committitur canalis tranſuerſus atque is ad lacum, qui
extra
domicilium eſt, pertinet.
Adoleſcens aut batillo uel trulla metallorum ra­
menta
impura, uel lapillos nigros impuros de aceruo ſumit, eosque in canalis
caput
inijcit, uel eidem illinit.
Lotor uerò eadem in canali agitat rutro ligneo:
quo
modo limus cum aquis permiſtus defluit in canalem tranſuerſum, ramenta
metallorum uel lapilli nigri in canali deuexo reſident: ſed quia interdum ramenta
uel
lapilli ſimul cum limo defluunt in canalem tranſuerſum, eum alter poſt ſpacium
ferè
ſex pedum aſſere claudit, & limum ſæpe batillo agitat, ut etiam is cum aquis mi­
ſtus
effluat in lacum, remaneantque in canali ramenta tantummodo uel lapilli.

Schlaccheualdi
& Irbereſdorfi lapilli nigri in iſtiuſmodi canali lauantur ſe­
mel
aut bis: Aldebergi ter quaterué: Gairi ſæpe ſepties: nam Schlaccheualdi
& Irbereſdorfi uena, in qua ſunt lapilli nigri ſatis magni, ſub pila ſubijcitur:
Aldebergi
, in qua multo minores: Gairi etiam ſaxorum fragmenta, in quibus
uix
exigui lapilli interdum conſpici poſſunt: hanc lauandi rationem metallici,
qui
tractant uenas plumbi candidi, primò excogitarunt: quæ deinde ex plumba
rijs
officinis in argentarias aliasque defluxit.
Certior. n. hæc lauandi ratio eſt que
cribris
etiam anguſtis.
Prope hunc canalem area, linteis extenſis contecta eſſe ſolet.

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