Cardano, Girolamo, De subtilitate, 1663

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Sed ſunt præter hæc artificioſa metallo­
rum
genera, quędam minus vulgata, vt quod
ex
argenti partibus duabus atque vna plum­
bi
conſtat, ad ſpecula fabricanda optima.
Sicut ſi in treis aurum ſupponatur, meliora

in
eo genere euadunt.
Et bracteæ, quæ gem­
mis
ſupponuntur, auro, argento, æreque con­
ſtant
, ſuperponunturque prunis, ſuſpenſæ
tamen
ne tangant, inde ex varia illorum pro­
portione
diuerſorum colorum ſplendorem

accipiant
.
Quæ carbunculum excipiunt,
ære
& auri parte vigeſimaquarta conſtant,
vnde
nullæ minus diuturnæ.
Aurichalcum
etiam
fit nobiliſſimum, auro pulchritudine
par
.
Calaminaris lapis ſeu magneſia, argen­
tum
, & æs cyprium, vel illius loco æs addito
vitro
.
Superponitur vitrum, ne magneſia
euaneſcat
: nec ſemel addidiſſe contentus
eris
vitrum atque magneſiam.
Hîc argen­
tum
pro albo plumbo, magneſiam pro cad­
mia
, cyprium æs pro communi ære ſubii­
cimus
, repetimuſque magneſiam ac vitrum.
Fiunt ex his vaſa præcipui vſus, ſed & ex
metallis
omnibus, quæ in cuſtodita parum
durant
.
Tribus modis franguntur: ignis ea
colliquat
, terebrat & fragilia reddit argen­
tum
viuum.
Percuſſa aut pondere preſſa fle­
ctuntur
.
Flexa rimam ducunt, aut rumpun­
tur
.
Ne flectantur dum lauantur, curæ ſit vt
terna
, quaternave ſimul lauentur: primoque
purgato
, poſtremum anteponatur: atque ita

mutata
vice, & omnibus ex æquo ſimul
compreſſionem
ſuſtinentibus, omnia deter­
guntur
abſque vitio flexuræ.
Quòd ſi flexu­
ram
duxerint, illicò malleolo ſenſim emen­
dentur
: ſicque æterna manent.
65[Figure 65]

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