Fabri, Honoré, Tractatus physicus de motu locali, 1646

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            <p id="N26443" type="main">
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              nùs retardat; </s>
              <s id="N26454">ſunt enim pauciores partes, quæ valde obliquè cadunt: </s>
              <s id="N26458">
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              hinc minor eſt appulſus, quod clarum eſt; hinc, vt calamus velociùs per­
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              gat, conſtringuntur pennæ. </s>
            </p>
            <p id="N2645F" type="main">
              <s id="N26461">Decimotertiò, ſi contractiores ſunt, & rectè compoſitæ, cum illa ſcili­
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              cet inflexione,
                <expan abbr="eoq;">eoque</expan>
              ſitu, de quo n.11.non modò velocior erit motus axis,
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              ſed etiam motus orbis; </s>
              <s id="N2646D">ratio eſt, quia minor orbis citiùs perficitur: </s>
              <s id="N26471">adde
                <lb/>
              quod minus aëris huic motui reſiſtit; </s>
              <s id="N26477">vnde vides ita eſſe aptandas pen­
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              nas, vt reſiſtentia aëris inæqualis cauſet illam vertiginem, quæ tamen
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              tanta eſſe non debet; alioquin ipſum motum orbis omninò impediret,
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              vt diximus n. </s>
              <s id="N26481">10. </s>
            </p>
            <p id="N26484" type="main">
              <s id="N26486">Decimoquartò, denique ſi plùs æquo contractæ ſunt, eſſet motus or­
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              bis; quippe modica eſt aëris reſiſtentia, quæ ad motum illum non ſufficit,
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              licèt ſemper ſint aliqui gyri, ſed rariores. </s>
            </p>
            <p id="N2648E" type="main">
              <s id="N26490">Decimoquintò, tres aliquando, aliquando duæ inſeruntur pennæ; </s>
              <s id="N26494">eſt
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              enim eadem vertiginis cauſa, imò quatuor inſeri poſſent; ſunt enim quaſi
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              totidem claui, qui dirigunt illum motum. </s>
            </p>
            <p id="N2649C" type="main">
              <s id="N2649E">Decimoſextò, ſi pennæ delicatioribus pilis tenera lanugine veſtian­
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              tur, tardiùs mouetur calamus vtroque motu; quia vix aëra penetrare poſ­
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              ſunt delicatiores mollioreſque pili. </s>
            </p>
            <p id="N264A6" type="main">
              <s id="N264A8">Decimoſeptimò, ſi proiicitur ſurſum, deſcendatque deorſum rectà, eſt
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              motus mixtus ex recto & circulari; </s>
              <s id="N264AE">ſi verò proiiciatur per horizontalem,
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              vel inclinatam, eſt motus mixtus ex duobus rectis & circulari, vt con­
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              ſtat; </s>
              <s id="N264B6">ex quo motu fit linea mixta ex Parabola & Helice; </s>
              <s id="N264BA">ſit enim cylin­
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              drus CH, cuius motus ſpiralis ſit CEFGT mixtus ex recto CT, & cir­
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              culari orbis CD; ſit etiam mixtus LTQ ex accelerato LM, & æquabili
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              MQ certè ſi addatur LQ circulus ſeu ſpira CEF, &c. </s>
              <s id="N264C7">ſitque RC æqua­
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              lis IE, & VT æqualis NG, habebitur ſpira mixta LCSVQ </s>
            </p>
            <p id="N264D0" type="main">
              <s id="N264D2">Decimooctauò, ſi pennæ latiores ſunt, ſeu maiorem habent ſuperfi­
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              ciem, minùs aptæ ſunt ad vtrumque motum, ſcilicet axis, & centri; quia
                <lb/>
              aër plùs æquo reſiſtit, nam plures illius pelluntur partes. </s>
            </p>
            <p id="N264DA" type="main">
              <s id="N264DC">Decimononò, ſi verò contractiores ſunt, etiam minùs aptæ videntur:
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              quippe aëra facilè diuidunt. </s>
            </p>
            <p id="N264E2" type="main">
              <s id="N264E4">Vigeſimò, ſi breuiores, certiſſimus eſt motus orbis; quia minor circu­
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              lus citiùs perficitur. </s>
            </p>
            <p id="N264EA" type="main">
              <s id="N264EC">Vigeſimoprimò, ſi longiores, è contrario: adde quod ab axis leuioris
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              motu, dirigi vix poſſunt. </s>
            </p>
            <p id="N264F2" type="main">
              <s id="N264F4">Vigeſimoſecundò, ſi altera pennarum ſit fracta, eſſet motus orbis; quia
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              ſegmentum fractum aliarum partium motum non ſequitur, vt patet. </s>
            </p>
            <p id="N264FA" type="main">
              <s id="N264FC">Vigeſimotertiò, ſi calamus ſit leuior, ineptus eſt; </s>
              <s id="N26500">quia reſiſtentiam
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              pennarum non ſuperat; quippe contra reflantis aëris vim, calami præua­
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              lens impetus leuiores pennas ſecum abripere debet. </s>
            </p>
            <p id="N26508" type="main">
              <s id="N2650A">Vigeſimoquartò, ſi longior ſit calamus, minùs aptus eſt; quia ſcilicet
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              plures partes impetus quæ inſunt grauiori calamo nullo negotio reſi­
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              ſtentiam aëris, & retardationem pennarum ſuperant. </s>
            </p>
            <p id="N26512" type="main">
              <s id="N26514">Vigeſimoquintò, ſi longior ſit calamus, minùs aptus eſt; </s>
              <s id="N26518">tùm quia gra-</s>
            </p>
          </chap>
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