Fabri, Honoré, Tractatus physicus de motu locali, 1646

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    <archimedes>
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        <body>
          <chap id="N24CC8">
            <p id="N2637B" type="main">
              <s id="N26389">
                <pb pagenum="359" xlink:href="026/01/393.jpg"/>
              tremitate pellitur; </s>
              <s id="N26392">igitur cum pellantur D & C; quid mirum ſi totus ca­
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              lamus cum ipſis pennis conuertatur. </s>
            </p>
            <p id="N26398" type="main">
              <s id="N2639A">Quintò, hinc motus calami eſt mixtus ex recto axis, & circulari or­
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              bis; </s>
              <s id="N263A0">igitur ſpiralis eſt; </s>
              <s id="N263A4">ſpiræ autem maiores ſunt, vel minores pro diuerſa
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              diſtantia partium ab axe AF, qui debet cenſeri productus vſque ad G; </s>
              <s id="N263AA">
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              nam partes, quæ longiùs diſtant ab axe, maiores ſpiras decurrunt; aliæ
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              verò minores; porrò ſpiræ ipſæ eò frequentiores ſunt, quò motus orbis
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              velocior eſt, & contrà rariores, quò tardior. </s>
            </p>
            <p id="N263B3" type="main">
              <s id="N263B5">Sextò, ſi ſit tantùm vnica penna, calamus non mouetur hoc motu; </s>
              <s id="N263B9">
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              quia vix aër verberatur; </s>
              <s id="N263BE">adde quod in eam partem, quæ caret penna im­
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              pulſus neceſſariò inclinatur; idem accidit cum altera penna fracta eſt,
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              vel minus aptè diuaricata. </s>
            </p>
            <p id="N263C6" type="main">
              <s id="N263C8">Septimò, in cam partem conuertitur, ſeu ſpiras agit, in quam pennæ
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              ipſæ detorquentur; </s>
              <s id="N263CE">alioquin non eſſet, cur potiùs in vnam, quàm in aliam
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              ſuos agerent orbes; </s>
              <s id="N263D4">igitur ita diuaricantur pennæ, vt earum plana ſibi in­
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              uicem ſint obliqua; </s>
              <s id="N263DA">cuius rei ratio prædicta clariſſima cùm ſit; non eſt
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              quod amplius de hac re laboremus. </s>
            </p>
            <p id="N263E0" type="main">
              <s id="N263E2">Octauò, ſi pennæ diſtractiones ſunt, & maximè diuaricatæ; </s>
              <s id="N263E6">motus
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              axis eſt tardior; ratio eſt, quia in eo ſtatu multum aëra pellunt, ſeu venti­
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              lant, à quo retinentur. </s>
            </p>
            <p id="N263EE" type="main">
              <s id="N263F0">Nonò, ſi diſtractiores ſunt, motus orbis eſt etiam tardior, ſuntque
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              rariores ſpiræ; </s>
              <s id="N263F6">ratio eſt eadem, quia cùm motus orbis eſt maior, etiam
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              plùs aëris vertigo illa ſecum abripit; </s>
              <s id="N263FC">hinc maior eſt reſiſtentia; vnde
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              obſeruabis, vt motus orbis minùs impediatur, ita pennas eſſe componen­
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              das, vt aëra ſua quaſi acie cæſim diuidant, ne ſi pellant tota ſua ſuperficie,
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              maior ſit reſiſtentia. </s>
            </p>
            <p id="N26406" type="main">
              <s id="N26408">Decimò, ſi demum plùs æquo ſint diuaricatæ, ita vt angulum obtuſiſ­
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              ſimum faciant, ceſſat omninò motus orbis propter maiorem reſiſtentiam,
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              quæ vertiginem illam impedit. </s>
            </p>
            <p id="N2640F" type="main">
              <s id="N26411">Vndecimò, ita pennæ aptari debent, vt ſenſim inflexæ à radice DE
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              verſus apices BC afflatum aëris diuerſum excipiant, & diſſimilem: vnde
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              accidit, vt partes ipſæ, quæ retardantur, & maiore vi pollent in vertigi­
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              nem agantur, in eam ſcilicet partem, in quam aliqua inclinatio conducit
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              ſic globus retentus à corpore oppoſito in orbem agitur propter rationem
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              prædictam, ne ille impetus ſit fruſtrà, qui adhuc ſupereſt. </s>
              <s id="N2641F">Hinc vides
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              motum orbis non imprimi calamo à pennis, ſed pennis à calamo; </s>
              <s id="N26425">qui
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              cùm ab illis retardetur, ne aliquid impetus ſit fruſtrà, ſupplet motu cir­
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              culari, quod recto difficiliori propter reſiſtentiam orbis conſequi non
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              poteſt; </s>
              <s id="N2642F">determinatur quidem motus circularis in talem partem ab ipſa
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              pennarum deflexione; </s>
              <s id="N26435">non tamen imprimitur: </s>
              <s id="N26439">hinc ſi fortè in via pen­
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              næ ex ſua theca decidant, calamus ipſe ſine nouo impulſu longiùs ſpa­
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              tium conficito; tribuit enim motui recto non impedito, quod circulari,
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              vel ſpirali, ſi pennæ adeſſent tribueret. </s>
            </p>
            <p id="N26443" type="main">
              <s id="N26445">Duodecimò, ſi pennæ contractiores ſunt, & angulum acutiorem fa­
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              ciant, calamus velociùs mouetur motu axis; </s>
              <s id="N2644B">ratio eſt, quia reſiſtentia mi-</s>
            </p>
          </chap>
        </body>
      </text>
    </archimedes>
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