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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fig. </
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<
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xml:space
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<
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xml:space
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">d e C k, h i m C ſint æqualia, quæ continentur inter paral-
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lelas aſymtotis AC, BC, quare etiam linea curva in Experimen-
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tis notata eſt Hyperbola.</
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<
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xml:space
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">Videamus an Experimenta reſpondeant demonſtrationi, in Ta-
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bula prima obſervabitur anomalia hinc inde, quæ provenit, quia
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non ſatis accnrate obſervare poſſumus altitudinem, videndo per craſ-
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ſitiem vitri; </
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<
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<
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">nec accurate ponere poſſumus ſpecula perpendicu-
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laria, 3° nec hæc ſuperficies tam perfecte planas habentac poſtulatur.
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</
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<
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">4° accedit puritas vel impuritas vitri, ut & </
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<
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">Aquæ & </
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<
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<
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xml:space
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">ve-
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rum tabula ſecunda melius reſpondet calculo; </
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<
s
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xml:space
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">nam ad diſtantiam
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6 pollicum eſt altitudo = 2. </
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<
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">ad diſtantiam. </
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<
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">3 pollicum eſt altitudo
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= 4 {1/4} eſt exceſſus hic = {3/4}. </
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<
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">ſupra calculum: </
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lic. </
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<
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xml:space
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">eſt altitudo = 10, quæ magnitudo eſt paulum plus quam du-
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plo major quam 4 {3/4}: </
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">& </
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<
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xml:space
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">= 19. </
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<
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xml:space
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">ubi eſt par-
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Aus defectus, cum debuiſſet eſſe = 20. </
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<
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">verum ſatis hæc reſpon-
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dent calculo. </
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<
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<
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xml:space
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ad diſtantiam duplo minorem eſt altitudo = 15. </
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<
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ad {1/2} pollic: </
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<
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xml:space
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">eſt = 28, debuerat eſſe = 30 lineis, ut foret du-
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plo major, verum hæc obſervata ſatis accurate reſpondent, ut cur-
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va deſcripta poſſit haberi pro Hyperbola: </
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<
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& </
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<
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in appendice, & </
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<
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<
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">Sint enim eadem ſpecula, quorum linea contactus ſit a c in om-
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nibus caſibus, hæc ſubmergantur ſub Aqua uſque ad a b, ſub co
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ſitu, quem figuræ 4, 5, 6, 7, 8, 10. </
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curvæ d d hyperbolicæ, quarum aſymptotæ erunt a b, a c. </
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ſi duo plana circularia fuerint, uti fig. </
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Hyperbola d d, & </
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lum in puncto c.</
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<
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">Quando latera ſe tangentia ſunt ſurſum poſita, parallela ſuperfi-
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ciei Aquæ, veluti in fig. </
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">omnino ſub Aqua ſubmerſa, tum
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extrahantur ſpecula lente in eadem poſitione, donec pondus Aquæ
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inter plana ſuperet vim attractionis ſpeculorum, generabuntur duæ
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curvæ, una â quolibet latere planorum, quæ ſe aperiunt, ſibique
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occurruntin medio, uti figura repræſentat, ibi vero uniuntur forman-
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do figuram, quam linea punctata refert, quæ nunc eſt in </
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