Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

Table of figures

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              <s id="s.001249">
                <pb pagenum="243" xlink:href="010/01/251.jpg"/>
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              pluuia deſcendat, fieri poteſt vt mercurius in fiſtula
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              ſupremam illam altitudinem M pertingat, in eaque
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              permaneat, & hoc nedum à nebulis, ſed à quacum­
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              que alia cauſa grauitante effici poteſt, ſi enim terre­
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              ſtris puluis à vento, vel alia commotion e ſursùm im­
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              pellatur, atque per aerem diſſipetur ſpargaturque
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              tunc nemo dubitat aerem grauiori niſu ſuperficiem
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              orbis terraquei comprimere. </s>
              <s id="s.001250">Si poſtea à qualibet
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              cauſa nebula impellatur, vt nimirùm terram attin­
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              gat, ſcilicèt pluuia paulatim terram aſſequatur
                <expan abbr="eã-que">ean­
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                que</expan>
              humectet, tunc patet innumera aquæ granulą
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              terræ innici, neque amplius aeris grauitatem, &
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              compreſſionem augere, & quia à terra ſubiecta ſu­
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              ſtentantur, non poſſunt vt priùs ſuo naturali pondere
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              comprimere ſuperficiem infimam mercurij ſtagnan­
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              tis, & propterea ſemper à minori pondere mercu­
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              rius in C comprimitur prout magis pluuia ad terram
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              perducitur, & prout magis aer illo pondere alleuia­
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              tur, & propterea ſuperficies eius in ſuprema fiſtulæ
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              parte ſenſim deprimitur vſque ad infimum ſitum F.
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              <s id="s.001251">
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              Cap. 5. de ae­
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              ris grauitate
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              æquilibrio,
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              ſtructura, &
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              vi elaterią
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              eius.</s>
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              <s id="s.001252">
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              Non tamen
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              conuerſa re­
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              gula vera est
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              nam ab alijs
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              cauſis eleua­
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              tio mercurij
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              in fiſtula va­
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              riari poteſt.</s>
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              <s id="s.001253">Licèt hoc verum ſit, non tamen indè elici poteſt
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              conuerſa regula generalis, vt nimirum quotieſcum­
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              que mercurius in fiſtula eleuatur debeat pluuia ex­
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              pectari, quando quidem poteſt huiuſmodi
                <expan abbr="augmentũ">augmentum</expan>
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              compreſſionis produci ab aliqua ingenti agitatione
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              ſupremæ atmoſphæræ; & ſi fortè à particulis aqueis,
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              & terreis ſubleuatis maior grauitas aeris producitur
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              fieri poteſt vt à violentia ventorum alibi tranſpor­
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              tentur nebulæ, & ſic pluuia alibi translata non deci-</s>
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