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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partes {12/814} pollicis ingreſſæ erunt in tubum, quæ quantitas eſt adeo
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exigua, ut vix ab oculo diſcerni queat, idcirco in Experimento
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etiam aliquid, ſed admodum parum Aquæ, tubum intravit Expe-
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rimentum hoc etiam inſtituit Honor. </
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<
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in Exper. </
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leg. </
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<
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<
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">qui tamen abſque demonſtratione id
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reliquerunt: </
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<
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">Ex eo autem conſtat Aërem in tubis his contineri ejus-
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dem denſitatis cum aëre ambiente, vel reliquæ atmoſphæræ: </
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<
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enim illum eſſe rariorem cum Rohaulto aliisque, an tum in tubum,
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etiamſi ſuperne clauſum, non premetur a præponderante atmoſphæ-
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râ liquor: </
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<
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">id omnino fieret, ſedipſa experientia obſtat, nihil ingredi-
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tur, quia aër internus & </
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<
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">externus æque denſus vi ſua elaſtica reſiſtit.</
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">inclinati ad horizontem, extremum ſupe-
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rius attingat guttam aquæ altius poſitam, hæc intus rapitur deſcenden-
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do uſque ad inferius extremum, totuſque tubus penitus impletur: </
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<
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autem velocitate majori deſcendens liquor per tubum in hoc Experi-
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mento, quam aſſurgit in ipſum erectum perpendiculariter in Exp. </
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<
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quia duplici vi hic fertur, unâ, qua in tubum adſcendere poteſt ad alti-
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tudinem perpendicularem 20 linearum, altera eſt ipſa gravitas, idcirco
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hac vi liquor motu fertur accelerato, veluti omnia gravia, uſque ad
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oram infimam tubi, ex quâ guttatim effluit. </
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<
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xml:space
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">Si vero eodem modo
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teneatur alius tubus, cujus inferius orificium clauſum eſt, nihil A-
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quæ ſuperius orificium ingreditur, nec deſcendit, excepta aliquâ,
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ſed vix nudo oculo conſpicienda quantitate; </
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<
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quam, nec guttulæ orificio appoſitæ gravitas, ſufficiunt ad aërem
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in tubo condenſandum, per demonſtrationem modo datam in Ex-
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perimento XIII.</
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in ſe Aquam rapiunt; </
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quam longitudini reſpondentem, cum duo diverlæ longitudinis </
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