Fabri, Honoré, Tractatus physicus de motu locali, 1646
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              <s id="N1CDA2">Obſerua quæſo, cum dico motum in plano inclinato eſſe ad motum
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              in perpendiculo, vt ipſæ lineæ permutando, ita intelligendum eſſe, vt
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              vel aſſumatur motus in ſingulis inſtantibus, ita vt eo inſtanti, quo datum
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              ſpatium in inclinata acquiritur, acquiratur duplum in perpendiculo; </s>
              <s id="N1CDAC">quo
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              poſito valet certè tantùm illa proportio ratione motus æquabilis, ſi ſer­
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              uari debet; nam perinde ſe habet phyſicè, atque ſi eſſet, vt iam fusè ex­
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              plicatum eſt lib.2. in re ſimili. </s>
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              Theorema
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              7.
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              Hinc deſcendit mobile per ſe in plano inclinato
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              ; </s>
              <s id="N1CDCF">ratio eſt, quia totus mo­
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              tus non impeditur, cum ſit eadem proportio, quæ eſt perpendicularis
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              ad inclinatam; dixi per ſe, nam per accidens in plano ſcabro tantillùm
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              inclinato mobile deſcendit, adde quod corpus graue tamdiu mouetur
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              quandiu accedere poteſt ad centrum terræ. </s>
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              Theorema
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              8.
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              Motus in infinitum imminui poteſt,
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              probatur, quia proportio perpen­
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              dicularis ad inclinatam poteſt eſſe minor in infinitum, quia inclinata
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              poteſt eſſe longior, & in infinitum. </s>
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              Theorema
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              9.
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              Ex his vera redditur ratio cur in plano inclinato ad angulum BG motus ſit
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              ſubduplus illius qui fit in perpendiculari
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              ; v.g. ſit angulus BAE 60. certè
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              AE eſt dupla AB, ſed motus in AB eſt ad motum in AE vt AE ad AB
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              per Th.6. igitur eſt duplus. </s>
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              <s id="N1CE1A">Ex his reiicies quoque Cardanum, & alios quoſdam, qui diuerſam
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              proportionem motuum in planis inclinatis deducunt ex diuerſis angu­
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              lis inclinationis; iuxta quam proportionem motus in AE eſſet ſubtri­
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              plus in AB contra experimentum. </s>
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              Theorema
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              10.
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              Motus acceleratur in plano inclinato
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              ; </s>
              <s id="N1CE3D">experientia clariſſima eſt, ratio
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              eadem cum illa, quam adduximus lib.3. cum de motu naturali, quia ſci­
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              licet prior impetus conſeruatur, & acquiritur nouus, Imò acceleratur
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              iuxta
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              proportionem, vel noſtram ſingulis inſtantibus, vel Gali­
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              lei in partibus temporum ſenſibilibus; vnde aſſumemus deinceps iſtam
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              Galilei proportionem, quia ſcilicet partes temporis ſenſibiles tantùm
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              aſſumere poſſumus. </s>
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              Theorema
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              11.
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              In plano inclinato eſt idem impetus innatus qui est in perpendiculari,
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              ſed
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              in hac habet totum ſuum motum, non verò in illa, quia impeditur, niſi
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              enim totus eſſet, non grauitaret corpus illud in planum inclinatum; </s>
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              quippe ſuas omnes vires impetus ille exereret circa motum; </s>
              <s id="N1CE73">igitur ali­
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              quid illarum exerit circa motum aliquid circa planum, in quod ex parte
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              grauitat; igitur idem eſt impetus innatus, adde quod ille eſt inſepa­
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              rabilis. </s>
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