Schott, Gaspar
,
Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet.
,
1657
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omnique humore deſtitutam, & quàm minimùm aêris conti
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nentem; deprehendiſſeque pondus fuiſſe unciarum 4,
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6, & granorum 15: poſtquam verò naturaliter refrixiſſet
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æolopila, & aër antea vehementer rarefactus redijſſet ad pri
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ſtinum ac naturalem ſuum ſtatum; iterum ponderaſſe ipſam,
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& inveniſſe pondus præcedente pondere majus fuiſſe 4 gra
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nis. </
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>(Apud Merſennum habetur, minus; utique typographi
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co errore.) </
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>Erat autem bilanx, inquit Merſennus, quæ dimi
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dio grani perdebat æquilibrium. </
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Aëris gra
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vitatem in
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venire.
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>Atque ex his patet, qua ratione aëris gravitas inveniatur. </
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Alij aliter explorant pondus aëris, præſertim Illuſtriſſimus Do
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minus Carolus Vintimillia Eques Panormitanus in Sicilia, & Ami
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cus Uranicus ſincei iſſimus, qui legendam mihi dedit demon
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ſtrationem ſubtiliſſimam, praximque hydroſtaticam, qua olim
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Adoleſcens coram Sereniſſimo Philiberto Siciliæ Prorege, No
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bilitateque Panormitana univerſa aërem ponderaverat. </
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<
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etiam quæ habet Daniel Lipſtorpius part. 3. Speciminum Phi
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loſophiæ Cartheſianæ cap. 2. in fine, ubi adducit modum Galilæi
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& Joann. Chryſoſt. Magneni.</
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<
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>Vide præterea Appendicem
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in fine Operis. </
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Propoſitio II.
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Quantum condenſari aër poſſit, invenire.
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Vide infrà
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Iconiſmi
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VIII. Figu
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ram IX. a.</
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>ASſumatur fons pneumaticus, qualem deſcribimus infrà,
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Parte 2. </
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>Claſſe 1. cap. 2. Machina 8. ejuſque capacitas exactè
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exploretur in menſura cubica aquæ. </
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<
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>Capiat autem dictus
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fons, gratiâ exempli, unum pedem cubicum, ſeu libras 72. </
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In hunc fontem immitte ſyringe, per foramen C, aquam
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quantum fieri, ſine ruptionis periculo, poteſt. </
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<
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>Si jam notam
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feceris in menſura, quantitatem aquæ immiſſæ, eamque à fon</
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tis capacitate detraxeris; reſiduum fontis indicabit locum
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aëris condenſati, qui priùs totam fontis capacitatem </
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