Guevara, Giovanni di, In Aristotelis mechanicas commentarii, 1627

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            <p id="N10687" type="main">
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              cunque pondera, ad aerem vel aquam artificiosè pellendam,
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              attrahendam, aut continendam, ad miſſilia proijcienda,
                <expan abbr="aliaq.">aliaque</expan>
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              ſecundum varias poſitiones locanda, vel de loco ad locum,
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              diuerſimodè transferenda, & ſimilia, quæ per ſe nota erunt
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              mechanicamenta omnia ad id præſtandum accomodata, ac
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              ſpeculationes mechanicas recenſenti. </s>
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              <s id="N106C9">Deinde obſeruandum eſt, ad prædictam motionem, aut
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              quietem arte conſequendam, duo potiſſimum conſiderari à
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              Mechanico; nimirum & quantitatem ponderis ex parte cor­
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              poris mouendi, & quantitatem virtutis ex parte mouentis, ſi­
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              ue immediatè ipſe moueat per virtutem intrinſecam, fiue per
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              impreſſionem impetus, aut per inſtrumenta. </s>
              <s id="N106D6">In hoc enim ars
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              ipſa mechanica ſita eſt, vt habita ratione ponderis, aut leui­
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              tatis corporis mouendi aut detinendi, proportionalis vis ad id
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              præſtandum adhibeatur,
                <expan abbr="congruaq.">congruaque</expan>
              applicentur machina­
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              menta, ad ſupplendum quod deeſt naturali virtuti. </s>
              <s id="N106E5">Quod
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              nequaquam fieri poſſet ſine conſideratione quantitatis vtriuſ­
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              que, nempe ponderis mouendi, & virtutis motiuæ vbi tota
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              fundari debet proportio vnius ad alteram. </s>
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              <s id="N106F0">Denique obſeruandum etiam erit, prædictam quantitatem
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              ponderis, tum grauitatem, tum leuitatem reſpectu
                <expan abbr="diuerſorũ">diuerſorum</expan>
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              à Mechanicis appellari. </s>
              <s id="N106FB">Maior enim quantitas ponderis re­
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              ſpectu minoris, ab ipſis dicitur grauitas; minor vero compa­
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              ratione maioris, dicitur leuitas. </s>
              <s id="N10702">Sicut illud corpus ab ipſis
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              dicitur leue, quod minus habet pondus reſpectu alterius; il­
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              lud vero graue, quod maius; etiam ſi per ſe ſimpliciter lo­
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              quendo vtrumque graue ſit. </s>
              <s id="N1070B">Non enim Mechanicus accipit
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              graue aut leue ſimpliciter & ſecundum ſe, quemadmodum vt
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              plurimum accipit Phyſicus (nempe per graue intelligendo,
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              quod nullam habet in ſe leuitatem, per leue autem quod nul­
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              lam habet in ſe grauirtatem;) ſed ſemper vtrumque accipit
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              reſpectiue; ita vt idem dicatur graue & leue reſpectu diuerſo­
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              rum, vt habetur etiam apud Ariſtotelem lib. 4. de cœlo tex.
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              27. vbi aer & aqua reſpectu terræ dicuntur leuia, reſpectu ve­
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              ro ignis, grauia. </s>
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            <p id="N1071F" type="main">
              <s id="N10721">His ergo præmiſſis facile primo intelligetur, ſubiectum ma-</s>
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