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

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              alligetur; & Orificium AB denuò veſica tegatur,
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              colligeturque ſtrictè: tandèm ſublata veſica infima
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              G concedatur egreſſus hydrargyro, vt nimirùm facta
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              ſolita vacuitate aeris remaneat hydrargyrum
                <expan abbr="ſuſpẽ-ſum">ſuſpen­
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                ſum</expan>
              vſque ad O, & altitudo GO erit proximè vnius
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              cubiti, & quadrantis. </s>
              <s id="s.000650">His præparatis ſumatur lens
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              aliqua cryſtallina KL, & directè Soli S exponatur in
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              ea diſtantia, & ſitu in quo præcisè vertex coni radio­
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              ſi à radijs Solis refractis conuergentibus formati ad
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              contactum pilæ bituminoſæ D pertingat. </s>
              <s id="s.000651">Idipſum̨
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              fieri poteſt ope ſpeculi concaui vſtorij radios Solis
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              reflectentis, tunc liqueſcere incipit pila D, & fumum
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              emittit, in quo apparet mirabilis operatio, non enim
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              fumus, veluti in aere aperto accidit, ſursùm aſcen­
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              dit, ſed incuruatur flectiturque deorsùm per DMN
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              non ſecùs ac virgulæ illæ aquæ cadentis è fontibus,
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              inflexas, & deorsùm tendentes lineas deſcribunt. </s>
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              Cap. 4. poſi­
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              tiuam leui­
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              tatem noņ
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              dari.</s>
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              <s id="s.000653">Porrò quia fumum non minùs quàm flammam
                <expan abbr="leuẽ">leuem</expan>
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              eſſe, atque ſursùm moueri ſponte ſua à naturali prin­
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              cipio impulſa,
                <expan abbr="cõmuniter">communiter</expan>
              Peripatetica Schola docet,
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              igitur neceſſario in ſpatio illo vacuo CEN, vel ſal­
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              tèm in quo aer non degit niſi valdè expanſus, & rare­
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              factus, fumus maiori vi ſursùm aſcendere deberet,
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              quàm in aere aperto, quia nimirùm ab aeris cor­
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              pulentia aliquo pacto impeditur ipſius progreſ­
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              ſus (videmus enim in aere aperto fumum ampliari,
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              diſſipari, ac diſpergi à prædicta aeris reſiſtentia,)
                <expan abbr="cũ-que">cun­
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                que</expan>
              in ſpatio illo vacuo, vel à quo aer deficit poſſit
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              fumus naturali leuitate non impeditus liberiùs, & fa-</s>
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