Agricola, Georg
,
De re metallica Libri XII, Quibus Officia, Instrumenta, Machinae, ac omnia ...
,
1556
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<
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99
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xlink:href
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001/01/109.jpg
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lus in terra defigitur: ad quem alter funiculus alligatus & affixus rectà duci
<
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tur in cuniculum uſque ad eum finem, dum nullum fundamenti uel tecti ue
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næ angulum attingat: poſtea à funiculo, ex inferiori tripode pendente, funi
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culus tertius, item affixus rectà ſurſum uerſus per decliuem montis partem
<
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ducitur uſque ad palum tripodis ſuperioris, atque ad eum alligatur et affigitur:
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ut autem altitudinis dimenſio certior ſit, unum & idem latus funiculi, ex in
<
lb
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feriori tripode pendentis, contingat tertius iſte funiculus, quod ſecundus,
<
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in cuniculum ductus, contingit: his omnibus ritè factis menſor cùm iam fu
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niculus, rectà in cuniculum ductus, angulum ſiue fundamenti ſiue tecti ta
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cturus eſt, in ſolum cuniculi collocat aſſerem, & ſuper eum ſtatuit
<
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orbẽ
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, uel
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<
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abbr
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inſtrumẽtum
">inſtrumentum</
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, quod indicem habet, ei peculiare: id circulis ceratis differt ab
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altero, cui item index, libro tertio à nobis deſcripto. </
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<
s
id
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N11D0B
">Ad utrumque autem, tan
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quam ad regulam & normam, decernit utrum funiculi extenti rectà
<
expan
abbr
="
tendãt
">tendant</
expan
>
<
lb
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ad extremam cuniculi partem, an modo rectà tendant, modo ad fundamen
<
lb
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tum uel tectum declinent: utrumque inſtrumentum in partes diuiſum eſt: ſed
<
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quod habet indicem, quem regit magnes, in quatuor & uiginti: orbis uerò
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lb
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in ſedecim. </
s
>
<
s
id
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N11D1C
">Etenim primò in quatuor principales, quarum quæque rurſus in
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quatuor: utrique ſunt circuli cerati, uerum ei, quod habet indicem, ſeptem: al
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teri, tantum quinque. </
s
>
<
s
id
="
N11D23
">Hos circulos ceratos menſor ſiue hoc ſiue illo utatur in
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lb
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ſtrumento, pungit, ipſis punctis ordine notans partes, in quas funiculi di
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lb
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uerſis modis extenduntur. </
s
>
<
s
id
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N11D2A
">Sed orbis præterea foramen habet ex eius exti
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ma parte circulari ad punctum uſque pertinens: in quod cochleam ferream,
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ad quam ſecundum funiculum alligat, immittit & uerſando in aſſerem infi
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git: ut etiam orbis maneat immobilis. </
s
>
<
s
id
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N11D33
">Ne uerò funiculus ſecundus & dein
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ceps alij extenti, de cochlea detrahantur, cauit ferro graui, in cuius foramine
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lb
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cochleæ caput includit: at alterum
<
expan
abbr
="
inſtrumentũ
">inſtrumentum</
expan
>
, cui index eſt, quia caret fo
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ramine, tantummodo ad cochleam apponit.</
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>
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type
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<
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">I
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nſtrumenti, cui index est, ſeptem circuli cerati
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type
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A B C D E F G,</
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