Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              per planum tantillùm inclinatum maximam corporis molem, quam per
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              aliud planum inclinatius, & accedens propiùs ad verticale minimè mo­
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              uere poſſet; </s>
              <s id="N24277">cuius effectus alia ratio non eſt, niſi quod impetus, qui im­
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              primitur mobili ad talem gradum velocitatis ſit determinatus; atqui in
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              perpendiculo eo motu moueri non poteſt, vt conſtat, ſed in plano lon­
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              giore. </s>
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              <s id="N24283">Quintò, hinc vera ratio, cur in ſuperiore arcu deſtruatur citò impe­
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              tus; </s>
              <s id="N24289">tardiùs verò in in inferiore; </s>
              <s id="N2428D">quia, cùm Tangens cuiuſlibet puncti ar­
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              cus ſit eius planum, & hæc in arcu ſuperiore accedat propiùs ad perpen­
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              diculum; non mirum eſt, ſi cum eo impetu per arcum ſuperiorem mo­
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              ueri non poſſit mobile cò non aſcendat, cuius tantùm ope per inferio­
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              rem arcum aſcendit. </s>
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              Theorema
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              26.
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              Omnes vibrationes numerari non poſſunt
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              ; </s>
              <s id="N242B2">certum eſt, cùm ſint infinitæ
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              ferè inſenſibiles, nec poteſt ſenſu diſcerni, quantus ſit arcus minimæ vi­
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              brationis; </s>
              <s id="N242BC">ſi tamen deſtrueretur tantùm impetus in aſcenſu ab impetu
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              innato, nec tenſio funis, triplex determinatio, reſiſtentia aëris, & diuerſæ
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              partes funis, quarum minores vibrationes impediuntur quidquam fa­
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              cerent, cognita differentia prima vibrationis & ſecunda, fortè cognoſci
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              poſſet numerus vibrationum cognito principio progreſſionis; </s>
              <s id="N242C8">quantus
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              verò ſit numerus vibrationum, quæ incipiunt à maiore, & quantus illa­
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              rum quæ incipiunt à minore etiam incertum eſt, v.g. ſi funependulum
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              AD demittatur ex O, & deinde ex L; </s>
              <s id="N242D4">certum eſt quidem eſſe plures vi­
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              brationes cum demittitur ex O toto eo vibrationum numero, quæ re­
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              cenſentur, donec perueniatur ad illam vibrationem, cuius aſcenſus con­
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              ſtat arcu DL; </s>
              <s id="N242DE">nam deinceps æqualis erit numerus earum, quæ conſe­
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              quentur, & earum, quarum prima demittitur ex L, vt patet; </s>
              <s id="N242E4">quot verò
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              præcedant vibrationes antequam perueniatur ad illam, cuius aſcenſus
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              eſt arcus DL; equidem aliqua obſeruatione affixo ſcilicet maiore qua­
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              drante parieti iu ſuos gradus diſtributo cognoſci poteſt, ſed nunquam
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              ſatis acurata. </s>
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              <s id="N242F2">Itaque certum eſt primò accelerari motum in deſcenſu, &c retardari
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              in aſcenſu. </s>
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              <s id="N242F9">Secundò, certum eſt impetum nouum accedere in deſcenſu in ſingu­
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              lis punctis arcus iuxta rationem ſinus recti arcus inferioris; in aſcenſu
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              verò imminui acquiſitum impetum in eadem ratione, omiſſa ea parte
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              impetus, quæ deſtruitur tùm in aſcenſu tùm in deſcenſu propter tenſio­
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              nem funis, & reſiſtentiam aëris. </s>
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              <s id="N24307">Tertiò, certum eſt, primum gradum impetus ſcilicet innatum concur­
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              rere ad deſcenſum; </s>
              <s id="N2430D">ſecus verò ad aſcenſum, & contra vltimum gradum
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              concurrere ad aſcenſum, ſecus ad deſcenſum; ſed hic vltimus gradus mi­
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              nimus eſt, & pro nihilo reputandus. </s>
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            <p id="N24315" type="main">
              <s id="N24317">Quartò, certum eſt aſcenſum minorem eſſe deſcenſu, nec funependu­
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              lum ad
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              , vnde dimiſſum eſt priùs, aſcendere altitudinem. </s>
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