Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              mi ſubduplum maximæ; igitur velocitas motus ſit æqualis maximæ, haud
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              dubiè ſpatium duplum percurretur. </s>
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              Theorema
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              43.
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              Hinc benè à naturâ inſtitutum fuit impetum naturalem innatum ſemper
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              conſeruari
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              ; </s>
              <s id="N19B53">alioqui violentus eſſet æquabilis, igitur nunquam deſineret:
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              quantum abſurdum! quale incommodum &c. </s>
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              Theorema
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              44.
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              Eadem eſt ratio ſeu proportio ictuum, & percuſſionum, quæ integrorum
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              ſpatiorum quæ ſcilicet toto motu percurruntur in aſcenſu & deſcenſu,
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              v. g.
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              corpus graue cadens ex data altitudine 48 pedum æqualem ictum infli­
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              git in fine deſcenſus, & in principio aſcenſus, quo ſcilicet ad
                <expan abbr="eãdem">eandem</expan>
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              altitudinem aſcenderet; </s>
              <s id="N19B81">probatur, quia æqualis acquiritur impetus in
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              deſcenſu alteri, qui deſtruitur in aſcenſu, aſſumptis dumtaxat ſpatiis illis
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              æqualibus; </s>
              <s id="N19B89">igitur æqualis eſt in fine deſcenſus, in quo eſt totus acquiſi­
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              tus, atque in principio aſcenſus, in quo nullus eſt deſtructus: </s>
              <s id="N19B8F">ad id verò,
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              quod dicebatur ſuprà de ſagitta, cuius ictus maior eſt initio aſcenſus,
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              quàm in fine deſcenſus non diffiteor; </s>
              <s id="N19B97">quia materia ſagittæ, tùm lignea
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              tùm plumea motum ſatis ſuperque retardat, vt differentia ictuum ſenſu
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              ipſo percipi poſſit; quæ tamen nulla perciperetur in aſcenſu deſcenſu­
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              que globi ferrei. </s>
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              Theorema
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              45.
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              Hinc reiicies Galileum, & alios eius ſectatores qui volunt impetum corpori
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              impreſſum deſtrui tantùm ab aëre
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              ; </s>
              <s id="N19BBC">quod pluſquàm falſum eſſe comper­
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              tum eſt, vt demonſtrauimus ſuprà Th. 20. quaſi verò non adſit aliqua
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              cauſa neceſſaria deſtructiua, ſcilicet impetus innatus; </s>
              <s id="N19BC4">hinc etiam eum­
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              dem reiicies, qui vult numquam fieri poſſe, vt motu naturaliter accelera­
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              to tanta acquiratur velocitas, quanta imprimitur in motu violento; </s>
              <s id="N19BCC">vult
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              enim motum acceleratum tranſire in æquabilem, cuius contrarium de­
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              monſtrauimus ſuprà Th. 131, l. 2. igitur cum creſcat ſemper velocitas,
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              nullus eſt finitus gradus, quem tandem non aſſequatur; immò vt dictum
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              eſt in præcedenti Th. aſſumptis æqualibus ſpatiis, impetus, qui eſt in
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              principio aſcenſus, æqualis eſt cum eo, qui eſt in fine deſcenſus. </s>
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              <s id="N19BDE">Diceret fortè aliquis cadentem globum ex altiſſimæ turris apice de­
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              clinare à perpendiculari antequam terram feriat, vt conſtat ex multis
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              experimentis; </s>
              <s id="N19BE6">igitur præualet tandem reſiſtentia aëris: </s>
              <s id="N19BEA">ſed reſpondeo id
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              tantùm accidere propter currentem illac aëris tractum; alioquin non
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              eſſet potiùs ratio, cur in vnam partem declinaret, quàm in aliam. </s>
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              Theoroma
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              46.
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              Non eſt eadem ratio ictuum, ſeu percuſſionum, quæ eſt ſegmentorum in­
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              tegri ſpatij
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              ; </s>
              <s id="N19C0D">v.g. in ſubduplo ſpatij ſegmento non eſt ſubduplus ictus, ſit
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              enim ſpatium integrum motus vîolenti OH, & principium motus ſit
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              in O, finis in H; </s>
              <s id="N19C17">accipiatur ſegmentum OM, quod eſt quaſi ſubduplum O
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              H, ictus in M non eſt profectò ſubduplus ictus in O, ſed tantùm in L, vt </s>
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