Schott, Gaspar
,
Mechanica hydraulico-pneumatica. Pars I. Mechanicae Hydraulico-pnevmaticae Theoriam continet.
,
1657
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lùm manui admotæ ſenſum inferat, ſed etiam aures ſono de
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mulceat, & quidem harmonico, ſi foramini aptentur fiſtulæ
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ſono Harmonico edendo aptæ, prout ipſemet Hero fieri
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jubet in multis, quas deſcribit in citato Libello, hydraulicis at
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que pnevmaticis Machinis. </
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>Quod etiam quotidie experimur
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in Hortis Romanis, Tuſculanis, Tiburtinis, & in ipſo etiam
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P. Athanaſij Kircheri muſeo. </
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Non igitur arbitrandum eſt,
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infert
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Hero,
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in his quæſunt, vacui naturam quandam coacervatam ipſam per
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ſe ipſam exiſtere ſed ſecundùm exiguas partes in aëre, & humido, alijsque
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corporibus diſſeminatam,
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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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ſus in incudes & malleos totus ingreditur
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(vt cum Plinio putat Hero;
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quod tamen, Merſenno teſte, experientiæ repugnat, nam ictu
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mallei in varias partes diſſilit, & ita poteſt igniri, vt pereat.) </
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) Hoc
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ipſiaccidit,
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ſubiungit Hero,
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non quòd vacuo careat, ſed ob conti
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nuatam denſitatem.
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>Corpora porro illa (aëris præſertim) quæ
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partes ſuas habent inter ſeſe cohærentes,
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non|tamen ex omni parte,
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ſed interiecta habent inter valla quædam vacua,
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(quæ vacuola appel
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lat Merſennus) bellè comparat Hero arenarum cumulo, inter
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cuius grana multæ aëris particulæ intercedunt; aitque, arenæ par
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ticulas particulis aëris ſimiles eſſe,
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verò, qui inter arenas in
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terjicitur, ſimilem vacuolis intra aërem contentis; quæ quidem
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vocuola tunc diſinere putat in aëre (alijsque corporibus) cùm
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accedente vi quapiam condenſatur aër; redire verò, cùm facta
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remiſſione in priſtinum ordinem reſtituitur aër ob naturalem
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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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tim atque vis externa deſinit. </
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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
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intervalla quædam vacua, ſicut arena, quæ eſt in littoribus. </
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<
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nimo concipiendum eſt, arenæ particulas corporibus aëris ſimiles eſſe, aë
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rem vero, qui inter particulas arenæ interiicitur, ſimilem vacuis intra
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aërem contentis. </
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<
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>Quamobrem vi quadam accedente äerem denſari con
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tingit, & in vacuorum loca reſidere, corporibus præter naturam inter
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ſeſe compreſſis: remiſsione verò factârarſus in cun dem ordinem reſtitui-
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