Musschenbroek, Petrus van
,
Physicae experimentales, et geometricae de magnete, tuborum capillarium vitreorumque speculorum attractione, magnitudine terrae, cohaerentia corporum firmorum dissertationes: ut et ephemerides meteorologicae ultraiectinae
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CORPORUM FIRMORUM.
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Elementis conſtante, vera erunt in fibra magis compoſita, con-
<
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ſtante ex aliquot fibris homogeneis juxta ſe poſitis, cum trahitur
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directione ſecundum longitudinem vel a potentia, pondere appen-
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ſo, aut â propria gravitate.</
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<
s
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xml:space
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">Sint enim duæ fibræ ſimpliciſſimæ, quæ conſtent ex elementis
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homogeneis & </
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<
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xml:space
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">hæ juxta ſe poſitæ conjungantur vel
<
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componantur in unam, tum potentia vel pondus, quæ ſeparare po-
<
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/>
terit hanc fibram compoſitam in aliqua ſectione transverſa, eandem
<
lb
/>
ſeparabit in qualibetalia, quia Cohærentia in qualibet ſectione eſt ea-
<
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dem: </
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>
<
s
xml:id
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xml:space
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preserve
">nam velutieſt Cohærentia Elementi in una fibra, ita eſt in altera,
<
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idque in qualibet altitudine, ergo earum ſumma in utraque fibra, hoc
<
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/>
eſt in compoſita, erit eadem in quacunque altitudine: </
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<
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xml:space
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<
s
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xml:space
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">quia fibra eſt
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lb
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gravis, ſolvetur ab appenſo pondere in parte ſuperiori, cum illi appli-
<
lb
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catur vis maxima, nempe ponderis appenſi, & </
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<
s
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xml:space
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">propria omnium par
<
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tium ab imo ad ſummum gravitas: </
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<
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xml:space
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">3°. </
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<
s
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xml:space
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">erit fibra æque cohærens ſi-
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ve longa ſive brevis fuerit; </
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<
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xml:space
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">nam in ſectione transverſa qualibet
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eandem Cohærentiam habet, ſive longa vel brevis fuerit, cum in
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qualibet fibra ſimpliciſſima eadem Cohærentia demonſtrata ſit: </
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<
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xml:space
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">quæ
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omnia fuerunt in præcedentibus Propoſitionibus probata obtinere
<
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in fibra ſimpliciſſima.</
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<
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xml:space
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<
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xml:space
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">Poſſunt corpora conſiderari tanquam compoſita ex-
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fibris; </
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<
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xml:space
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">nam omnis funis conſtat ex filis, quodlibet filum ex fila-
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mentis ſubtilioribus, uti docent Microſcopia: </
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<
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xml:space
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">omne lignum ſepara-
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tur fiſſione in fibras oblongas, quæ inſpectæ Microſcopio componun-
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tur ex fibrillis ſubtilioribus, cavis, harum parietes ex fibrillis ſo-
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lidis ſubtiliſſimis: </
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<
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xml:space
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">eo modo omnia metalla, lapides, chordæ ex
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inteſtinis animalium, aliaque corpora ſe habent: </
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cylindrus metalli ſolidus, cujus baſis unum pollicem adæquat,
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præter quam congeries filamentorum metallicorum tenuium ſibi
<
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conjunctorum, quæ eam craſſitiem formant; </
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<
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corpora conſiderari poſſunt uti congeries fibrarum, hinc omnia
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demonſtrata hactenus de fibra ſimpliciſſima convenient quoque cor-
<
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poribus magnis, ſi nullæ aliæ conditiones iis acceſſerint.</
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