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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INTRODUCTIO AD COHÆRENTIAM
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molle, ictuumque numerum duritiem exhibiturum.</
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<
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">Verum plurima corpora diverſa gravitate ſpecifica donantur,
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nec ſub eodem volumine eandem quantitatem corpoream compre-
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hendunt, adeoque cum parallelopipeda æque magna diſſecan-
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tur, non eadem quantitas corporea dividitur, ſed graviorum
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major, leviorum minor, unde ictuum in cuneum illapſorum quan-
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titas duritiem exhibere non poterit corporum. </
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<
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xml:id
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">niſi dividantur per
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gravitatem corporum, quotientes tum exhibebunt durities quæſi-
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tas: </
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<
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">Ut ictus corporis percutientis cuneum ſemper foret æqualis,
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adhibita fuit Machina percuſſoria, quam exhibet Tab. </
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">3, ex filo H K A ſuſpenſus fuit globus eburneus A, qui elevatus
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continuo uſque ad normam exſtantem B, indeque dimiſſus, ſemper
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cadebat cum eadem velocitate, iiſdemque viribus in cuneum C D. </
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ſollicite cautum fuit, ut hujus globi centrum oſcillationis directe
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ſemper percuſſerit cuneum C D; </
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<
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">erat G parallelopipedum plum-
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beum 100 librarum, ut foret immobile, & </
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<
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ictu oriunda: </
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">E F exhibet parallelopipedum tranſverſe ſecandum: </
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C D eſt ferreus cuneus, cujus acies primo reddita fuit politiſſima,
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atque inclinata planities lævigatiſſima & </
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">manu detinui cu-
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neum C D, ut eadem vi applicaretur corpori E F, nec reſiliri poſ-
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ſet facto ictu, ſuftinebatur tamen inferius a plano, ut accuratiſſi-
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me ab A feriretur: </
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<
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xml:space
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">certo ictuum numero abſoluto deprehendebam
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ultimum non requiri tantum, ac priores fuerant, ad corporis in-
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tegram diſciſſionem, tum globus ex minori altitudine elevatus fuit,
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indeque fractiones ſurrexerunt, quæ ſimul cum numero ictuum
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deprehenduntur in ſequenti Tabula: </
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">bis modo contigit cunei aciem
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fuiſſe acuendam, quod fieri adeo ſollicite non potuit, quin quædam
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immutatio fuerit inducta ſuperficiei, impediens quominus tentamina
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poſteriora cum prioribus accuratiſſime conveniant; </
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">ne decipiam,
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malui defectus annotare, præſtare hoc opinor, quam inani jactan-
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tia ignaros fallere: </
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