Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              dit perpendiculariter in perpendiculum AD, idem dico de plano YD,
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              cuius perpendiculum vt inueniatur, ex centro A adducatur perpendicu­
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              laris in YD: </s>
              <s id="N1E385">hinc non poteſt deſcendere corpus ad centrum terræ per
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              planum inclinatum rectilineum quia linea recta quæ ducitur ad cen­
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              trum eſt perpendiculum; igitur non eſt planum inclinatum. </s>
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              Theorema
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              69.
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              </s>
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              Poteſt determinari motus duorum planorum inclinatorum quorum idem
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              est perpendiculum,
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              ſit enim arcus terræ GFC centro A; </s>
              <s id="N1E3A8">ſint duo plana
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              FK GFL quorum idem eſt perpendiculum LA; </s>
              <s id="N1E3AE">motus in K per KF initio
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              eſt ad motum per K vt DC ad DCA; </s>
              <s id="N1E3B4">ducatur autem AH perpendicula­
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              ris in GL, & centro A ducatur arcus HE, ducaturque vel HO perpendi­
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              cularis in AL vel CP in AH; </s>
              <s id="N1E3BC">dico motum in L eſſe vt PC ad CA: ſed
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              hæc ſunt facilia. </s>
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            <p id="N1E3C2" type="main">
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              Theorema
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              70.
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              </s>
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            <p id="N1E3D0" type="main">
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              Nullus gradus impetus deſtruitur in deſcenſu KF vel MF per ſe
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              ; </s>
              <s id="N1E3DB">quia nihil
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              eſt à quo deſtruatur, dixi per ſe; nam per accidens aliquid deſtrui poteſt
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              tùm ratione plani ſcabri tùm etiam ratione aëris. </s>
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            <p id="N1E3E3" type="main">
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              Theorema
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              71.
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              </s>
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              Omnes gradus acquiſiti in deſcenſu concurrunt ad deſcenſum præter vnum
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              ſcilicet præter acquiſitum vltimo instanti deſcenſus
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              ; quia impetus non con­
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              currit ad motum primo inſtanti quo eſt, per Th. 34. lib.1. de omnibus
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              aliis certum eſt quod concurrant, quia non impediuntur, igitur concur­
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              runt per Ax.12. lib.1. </s>
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            <p id="N1E405" type="main">
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              Theorema
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              72.
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              </s>
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              Omnes gradus impetus qui concurrunt ad deſcenſum, concurrunt ad aſcen­
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              ſum præter vnum
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              ; </s>
              <s id="N1E420">probatur, quia ſi omnes concurrerent, maior eſſet aſ­
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              cenſus deſcenſu quod eſt abſurdum: adde quod impetus innatus ad li­
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              neam ſurſum determinari non poteſt per Th.12. ſed impetus innatus
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              concurrit ad deſcenſum, vt patet. </s>
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            <p id="N1E42A" type="main">
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              Theorema
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              73.
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              </s>
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            <p id="N1E438" type="main">
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              Hinc tot concurrunt ad aſcenſum quot ad deſcenſum
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              ; </s>
              <s id="N1E443">nam ad aſcenſum
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              omnes præter vltimum, ad deſcenſum omnes præter primum; igitur tot
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              concurrunt ad aſcenſum, quot ad deſcenſum. </s>
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              <s id="N1E44D">Dices, primo inſtanti aſcenſus aliquis gradus deſtruitur. </s>
              <s id="N1E450">Reſponderet
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              aliquis, tranſeat antecedens, quia cùm inſtanti vltimo deſcenſus omnes
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              gradus præter innatum exigant motus pro ſequenti inſtanti, quod eſt pri­
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              mum inſtans aſcenſus; certè tot concurrunt ad primum inſtans aſcenſus,
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              quot ad vltimum deſcenſus, licèt aliquis gradus deſtruatur pro primo in­
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              ſtanti aſcenſus. </s>
              <s id="N1E45E">Reſponderet alius, cùm primo inſtanti aſcenſus gradus
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              ille qui vltimo deſcenſus productus eſt concurrat ad motum, igitur illo
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              inſtanti fruſtrà non eſſe, igitur non debere deſtrui, cùm eo tantùm no­
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              mine deſtruatur impetus; </s>
              <s id="N1E468">igitur primo inſtanti aſcenſus non deſtrui </s>
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