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

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1digitos, ſuperiori parte rotundum. At bractea habet tria foramina, in utroque
latere unum, tertium in poſteriori eius parte: quæ lata ſunt digitum, longa
tres digitos: per ea tum cinis ex carbonibus candentibus decidit, tum ſpirat
flatus penetrans in cameram, quæ ſub ipſa bractea eſt: itaque is flatus ignem
excitat.
Quam ob rem hæc fornacula, quam metallici propter uſum ab expe­
riendo appellant, apud chymiſtas ex uento nomen inuenit: uerum bracteæ
ferreæ pars, quæ è fornacula extat & eminet longa eſſe ſolet dodrantem, la­
ta palmum.
In ea carbunculi locati expeditè in fornaculam per ipſius os for
cipe imponuntur, rurſusque, ſi res hoc poſtulat, ex fornacula exempti in ea­
dem reponuntur.
Bracteæ foramina A. Eiuſdem pars quæ extat e fornacula B.
61[Figure 61]
Ferrea autem fornacula conſtat ex quatuor bacillis ferreis, altis ſeſquipe­
dem, inferius parumper diuaricatis & latis ut firmius ſtare poſſint: ex quo­
rum duobus prior fornaculæ pars, ex duobus poſterior efficitur: cum iſtis
bacillis utriuſque partis conglutinata & conferruminata ſunt bacilla ferrea
tranſuerſaria, numero tria: prima ubi ad altitudinem palmi aſſurrexerunt:
ſecunda ubi ad altitudinem pedis: tertia in ſumma eorum parte.
Recta
quidem bacilla ca parte perforata ſunt, qua cum ipſis conglutinantur
tranſuerſaria, ut à lateribus in ea includi poſsint alia bacilla ferrea ſimi­
liter utrinque tria numero.
Itaque duodecim ſunt bacilla tranſuerſaria,
quæ tres efficiunt ordines, imparibus interuallis diſtinctos: etenim ab u­
no bacillo recto ad alterum in infimo ordine eſt interuallum unius pedis &
quinque digitorum.
At in medio inter priora quidem bacilla & poſteriora eſt
ſpacium trium palmorum & unius digiti.
Laterum uerò bacilla inter ſe di­
ſtant tribus palmis et totidem digitis: ſed in ſupremo ordine inter priora qui­
dem bacilla et poſteriora eſt interuallum duorum palmorum, inter laterum
uerò bacilla trium, ut iſto modo fornacula in ſumma parte fiat anguſtior:

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