Cardano, Girolamo
,
De subtilitate
,
1663
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ita vt FD, circumagi poſſit verſus E, quan
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docunque FD, non prematur ab ED: nam
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FD, orbiculo infigitur: tracta igitur CD, re
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labitur FD, verſus E, ſed tamen à latere
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propter pondus, G, igitur ED, ferrum,
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quod ab FD, retinebatur, relabetur ad la
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queare HE, trahens ſurſum DC. </
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Inſtrumen
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tum quo tra
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hens trahi
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tur.</
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<
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">Inſtrumentum facilè hominem ſurſum
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trahens: troclea cum vnco ferro, in ea orbi
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culus de more, circa quem funis, in fune
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pondus A paulò minùs pondere corporis tui
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ex altera parte baculus tranſuerſus B. </
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<
s
id
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s.012242
">Ergo
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appenſo vnco trahes B, infra vt A, pondus
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ſurſum aſcendat, & B, infrà perueniat. </
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<
s
id
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s.012243
">Inſi
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dens igitur B, & èx altera parte apprehenſa
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AC manibus, quia A pondus paulò minùs
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eſt pondere tui corporis, A deſcendet rurſus
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te aſcendente facillimè: cùm libuerit deſ
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cendere, id ſpontè facies, cùm corpus tuum
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grauius ſit, quàm A, igitur dimiſſa fune rap
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tim deſcendes. </
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Inſtrumen
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tum, quo
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quiſque ſei
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pſum ſurſum
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trahit.</
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<
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">Aliud Agrippæ. </
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">Forcipes binos fabrica
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bat, ex toto ſibi inuicem ſimiles: vnius ima
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ginem in margine deſcriptam vides: KMO,
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& LMN, chalybis fruſta iunguntur in M,
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volubili circa clauum motu, perficiuntque
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forcipem integrum vnum, ſupremæ partes
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KM, & LM, ſic coëunt, vt dum conſtringun
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tur, altera alteram ſubingrediatur, formam
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cochleæ referentes. </
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<
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id
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">Inter has funis iacet,
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cùm vſus eſt. </
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id
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">Cæterùm rectæ NM, & OM,
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in imo
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abbr
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annulũ
">annulum</
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habent, cui funiculus validus
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MO, intruditur. </
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>
<
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id
="
s.012249
">Vſus hic eſt: apprehenditur
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(vt dixi) funis
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expan
abbr
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cũ
">cum</
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>
KM, & LM,
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abbr
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cõſtringendo
">conſtringendo</
expan
>
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NO, conſtringitur
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autẽ
">autem</
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impoſito pede ſuper
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NO:
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nã
">nam</
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quantò grauius fuerit corpus, eò ma
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gis NO, ſinuabitur,
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abbr
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arctiuſq;
">arctiuſque</
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conſtringetur
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funis à forcipe. </
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>
<
s
id
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">Eò igitur tutior aſcenſus, quò
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qui aſcendit, grauior eſt. </
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<
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id
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">Inde igitur forci
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pem alium cubito altius priore funi iunges,
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impoſitoque pede dum reliquum tollis,
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abbr
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pedẽ
">pedem</
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>
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& forcipem ipſum inferiorem auferes, ſu
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praque ſecundum tantundem collocabis, at
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que ita tutus velut per ſcalam vſque ad ſum
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mum vnico fune cùm vncino, & duobus
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forcipibus aſcendens: cochleæ enim forma
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impedit, ne forceps imprudenter labatur per
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funem. </
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Inſtrumen
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tum aliud
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Agrippæ ad
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idem.</
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<
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id
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">Hæc aſcendendi ratio, ſed ad aſcenden
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dum ſatis inepta, ſi ad alia inſtrumenta com
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paretur. </
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<
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">Igitur ad deſcenſum, facillimum ex
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cogitauit modum. </
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">Cochleæ è chalybe, palmi
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longitudine intùs inanis, ita vt funem HG,
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poſſit excipere, vocetur AB, circa eam leuis
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ex aurichalco capſula ſuprà, & infrà perfo
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rata: in imò eius appendices duo, in quibus
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funiculi C, & D, ferreum ſuſtinentes
<
expan
abbr
="
baculũ
">baculum</
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>
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EF, cui cum deſcenſurus inſederit, celerrimè
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deſcendet, & abſque vllo incommodo. </
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<
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">Quòd
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ſi vel funem G, trahat inferiùs, vel ad ſe
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ABC, cochlea non deſcendet, quia per ex
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tenſionem facta recta GH, non permittit
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cochleam labi. </
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<
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id
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">Similiter cùm ad ſe trahit G,
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ſuperiuſque, vertitur, nullo modo deſcendet,
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ſed quieſcet. </
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<
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">Ergo & celerrimè deſcendet, &
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facillimè quieſcet, nulloque labore. </
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<
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id
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">Sed
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hoc & nautæ ſciunt, qui ſimplici bacillo in
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ſidentes ter aut quater illi circumacta fune
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deſcendunt tenentes funem G, quam ſi ſen
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ſim demittant, deſcendunt, ſin trahant vehe
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mentiùs, quieſcunt ſedentes. </
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<
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id
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">Verùm hoc in
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tereſt, quòd qui baculo inſident, facilè
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abbr
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cadũt
">cadunt</
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,
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quia inclinentur ob funis obliquitatem, niſi
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experti, & audaces fuerint. </
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<
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id
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">At inſtrumentum
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hoc, quod vidi, tractauique ſæpiùs, quòd
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abbr
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sẽ-
">sem
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per</
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habeat in æquilibrio EF, abſque timore
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eſt, tutoque licet ei quemlibet quantumvis
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inexpertum inſidere. </
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<
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id
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">Verùm poſtquam iam
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machinarum, & ponderum ratio à me ſuffi
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cienter, explicata eſt, vt iam nil aliud adden
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dum videatur, vnius vulgaris
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inſtrumẽti
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, ſed
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mirabilis roboris ratio quærenda eſt? </
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<
s
id
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">Hoc
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vtuntur, qui ligna
<
expan
abbr
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ſecãt
">ſecant</
expan
>
, ſuſtinet
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que trabem, & in trabis cacumi
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ne hominem, tum etiam
<
expan
abbr
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impetũ
">impetum</
expan
>
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ſerræ deſcendentis. </
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<
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id
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">Inſtrumen
<
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tum ABC, conſutis tignis ac
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clauis ligneis firmatis. </
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<
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id
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">Sub B, &
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& C pediculi palmo minores, quibus à terra
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eleuatur A in terra poſito: DE, fibula ſu pe
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requitans trabem: quæritur, cur cum F,
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grauior ſit longè, non eleuet A, & cadat?
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</
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<
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id
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">Cauſa eſt, quia ſi parùm erigitur, pars quæ </
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