Casati, Paolo
,
Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae
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tro, non eſt æqualis angulo à perpendiculo,
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& lineâ visûs ex extremâ diametro, quia pa
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rallelæ eſſe non poſſunt duæ lineæ eundem̨
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circuli quadrantem tangentes. </
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>Oculus au
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tem in extremâ diametro poſitus, vtpotè
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magis à tellure remotus, plus terræ videt ſub
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minore angulo: neque omninò contemnen
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da eſt altitudinum differentia, ſi Quadrantis
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Radius pedes quinque ſecundùm longitudi
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nem habere ponatur; cum circuli in terrâ
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maximi quantitas, quæ patet oculo decem
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pedes alto, ſit ferè ſeſquialtera eius, quæ pro
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ſpicitur ab oculo quinque tantùm pedes à
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terrâ remoto. </
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Gal.
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<
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> Non eadem eſt ratio; ſi in arenâ
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litoreâ, ac in editâ turri, aut in colle obſer
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uationem, vt hìc ſupponimus, inſtituas; cum
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enim terræ ſemidiameter aucta oculi altitu
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dine ſit Secans Complementi anguli obſer
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uati, ſecantes autem angulorum æqualiter
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creſcentium addant ſemper maiorem, &
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maiorem differentiam, patet quàm modi
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cum anguli diſcrimen intercederet, ſi non
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ad centrum Quadrantis, ſed ad extremam
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circuli diametrum applicaretur oculus iņ
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vltimum Horizontem directus ſecundùm
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regulam lateri Quadrantis parallelam. </
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<
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quicquid de hoc eſſe contingat, certum eſt </
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