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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tiſſimæ: </
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<
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">diſcrepat præterea hoc examen multum ab eo Capitis V,
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in quo corpora uno extremo foramini immiſſa arcte comprehende-
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bantur, hic vero extrema libera manent ſurſumque adſcendunt
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medio impoſitis ponderibus; </
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<
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">quod efficit, ut minus nunc reſiſtant ea,
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quæ ex fibris longioribus concreverunt, quam quando foramini
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aliquouſque inſeruntur: </
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<
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">Galilæus hanc doctrinæ partem non qui-
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dem intactam reliquit, ſed tantum unâ alterave Propoſitione in-
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choavit, quam longe pluribus amplificarunt deinde Marchettus,
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Varignonus, Parentius, Grandi; </
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<
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">eſt vero multo ſubtilior inveſti-
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gatu reliquis, quia hic Natura vectium longitudines, momentaque
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ponderum occultaſſe præcipue videtur: </
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<
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">ab Experimentis autem
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primo incipiam, quia hæ baſes ſequentium omnium eſſe debent,
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quæ ſunt capta Machinæ ope repræſentatæ in Tab. </
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<
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<
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">Sunt AA, AA duo aſſeres ſuis pedibus BB inſiſtentes, qui ſe-
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cum invicem junguntur ope 4 lignorum transverſorum EE, EE,
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EE, EE, ne a ſe vel tantillum recedant; </
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<
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">diſtant aſſeres AA a ſe
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mutuo 18 pollic: </
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">uterque rimam C, C capit ejus latitudi-
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nis, ut corpora examinata accurate comprehendat: </
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ponitur Tabulæ T T, perforatæ in K, per quam tranſit Funis FF,
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annexus Lanci G, cui pondera P frangentia corporis D D Cohæ-
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rentiam imponuntur. </
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<
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">In rimâ C C poteſt utraque extremitas cor-
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poris D D inter tentandum libere aſſurgere, ſuntque earum infima,
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vera fulcra; </
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<
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">rimas ejuſmodi inſculpere tenebar, quoniam exami-
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nans corpora diverſæ altitudinis deprehendebam, ea fulcris tan-
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tummodo impoſita, aliquando intorqueriita, ut latiorpars niteretur
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fieri horizontalis, quæ accuratiſſime perpendicularis manere de-
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bebat; </
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">rimæ C C hoc incommodum præcavent: </
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eodem aſſere Ligni Quercici mediocris duritiei præparata ſunt va-
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ria parallelopipeda, ſecundum longitudinem ex Ligno fiſſa, ne
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corpora ex fibris flexuoſis incurvatiſque conſtarent; </
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dem longitudinis ſumebantur, & </
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