Schott, Gaspar, Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet. , 1657

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              <s>
                <pb xlink:href="051/01/051.jpg" pagenum="20"/>
              lùm manui admotæ ſenſum inferat, ſed etiam aures ſono de­
                <lb/>
              mulceat, & quidem harmonico, ſi foramini aptentur fiſtulæ
                <lb/>
              ſono Harmonico edendo aptæ, prout ipſemet Hero fieri
                <lb/>
              jubet in multis, quas deſcribit in citato Libello, hydraulicis at­
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              que pnevmaticis Machinis. </s>
              <s>Quod etiam quotidie experimur
                <lb/>
              in Hortis Romanis, Tuſculanis, Tiburtinis, & in ipſo etiam
                <lb/>
              P. Athanaſij Kircheri muſeo. </s>
              <s>
                <emph type="italics"/>
              Non igitur arbitrandum eſt,
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              infert
                <lb/>
              Hero,
                <emph type="italics"/>
              in his quæſunt, vacui naturam quandam coacervatam ipſam per­
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              ſe ipſam exiſtere ſed ſecundùm exiguas partes in aëre, & humido, alijsque
                <lb/>
              corporibus diſſeminatam,
                <emph.end type="italics"/>
              etiam in ipſo adamante, duriſſimo licet,
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              denſiſſimoque,
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              quippe qui neque igniri, neque rumpi poteſt, & percuſ­
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                <arrow.to.target n="marg60"/>
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              ſus in incudes & malleos totus ingreditur
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              (vt cum Plinio putat Hero;
                <lb/>
              quod tamen, Merſenno teſte, experientiæ repugnat, nam ictu
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              mallei in varias partes diſſilit, & ita poteſt igniri, vt pereat.) </s>
              <s>
                <emph type="italics"/>
              ) Hoc
                <lb/>
                <expan abbr="autẽ">autem</expan>
              ipſiaccidit,
                <emph.end type="italics"/>
              ſubiungit Hero,
                <emph type="italics"/>
              non quòd vacuo careat, ſed ob conti­
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              nuatam denſitatem.
                <emph.end type="italics"/>
              </s>
              <s>Corpora porro illa (aëris præſertim) quæ
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              partes ſuas habent inter ſeſe cohærentes,
                <emph type="italics"/>
              non|tamen ex omni parte,
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              ſed interiecta habent inter valla quædam vacua,
                <emph.end type="italics"/>
              (quæ vacuola appel­
                <lb/>
              lat Merſennus) bellè comparat Hero arenarum cumulo, inter
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                <arrow.to.target n="marg61"/>
                <lb/>
              cuius grana multæ aëris particulæ intercedunt; aitque, arenæ par­
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              ticulas particulis aëris ſimiles eſſe,
                <expan abbr="aërẽ">aërem</expan>
              verò, qui inter arenas in­
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              terjicitur, ſimilem vacuolis intra aërem contentis; quæ quidem
                <lb/>
              vocuola tunc diſinere putat in aëre (alijsque corporibus) cùm
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              accedente vi quapiam condenſatur aër; redire verò, cùm facta
                <lb/>
              remiſſione in priſtinum ordinem reſtituitur aër ob naturalem
                <lb/>
              contentionem, quâ, velut arcus inflexus, aut ſicca ſpongia vi
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              preſſa, molem ab ipſo rerum conditu ſibi tributam repetit, ſta­
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                <arrow.to.target n="marg62"/>
                <lb/>
              tim atque vis externa deſinit. </s>
              <s>
                <emph type="italics"/>
              At aëris corpora,
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              inquit Hero,
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              inter­
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              ſeſe quidem cohærent, non tamen ex omni parte, ſedinteriecta habent
                <lb/>
              intervalla quædam vacua, ſicut arena, quæ eſt in littoribus. </s>
              <s>Itaque a­
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              nimo concipiendum eſt, arenæ particulas corporibus aëris ſimiles eſſe, aë­
                <lb/>
              rem vero, qui inter particulas arenæ interiicitur, ſimilem vacuis intra
                <lb/>
              aërem contentis. </s>
              <s>Quamobrem vi quadam accedente äerem denſari con­
                <lb/>
              tingit, & in vacuorum loca reſidere, corporibus præter naturam inter­
                <lb/>
              ſeſe compreſſis: remiſsione verò factârarſus in cun dem ordinem reſtitui-
                <emph.end type="italics"/>
              </s>
            </p>
          </chap>
        </body>
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