Gassendi, Pierre, De proportione qua gravia decidentia accelerantur, 1646

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            <p type="main">
              <s id="s.000868">
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              angulorum æqualitate, ita fluentem, ac deſcenden­
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              tem concipi postulas, vt etiam intelligamus partem inter
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              lineas
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              AB, AC,
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              interceptam continuò ea ratione augeri,
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              vt notatis in
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              AB,
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              &
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              AC,
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              partibus æqualibus
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              AE, EG,
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              GI, IL,
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              ſemper interceptarum parallelarum incrementa
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              haberi æqualia aduertamus. </s>
              <s id="s.000869">Nempe vt
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              AG
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              dupla est
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              ipſius
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              AE,
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              ſic
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              GF
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              dupla est ipſius
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              ED:
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              & eadem ratione
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                <lb/>
              IH
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              eiuſdem
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              ED
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              eſt tripla, &
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              LK
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              quadrupla, atque
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              ita deinceps. </s>
              <s id="s.000870">Ex quibus ita concludis:
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              Quare aſſumptis
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              partibus æqualibus temporis per parteis æqualeis lineæ
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              AC repræſentatis, notum eſt momenta, ſeu incremen­
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              ta velocitatis per parallelas repræſentatæ æqualia ac­
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              quiri ſub huiuſmodi partibus.
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              Hæc ſanè vera ſunt;
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              ſed recordare verißimè quoque à te dictum numero
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              IV.
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              pun­
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              ctum
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              A
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              poſſe non tantum pro initio temporis haberi, ſed etiam
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              pro initio spatij, & (vt item addis) pro initio velocitatis.
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              </s>
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            <p type="main">
              <s id="s.000871">Recordor; ſed adnoto ſimul habuiſſe me punctum
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              A, pro initio temporis quidem æquabiliter ſluentis,
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              prout comparatur ad lineam AC (aut AB) in parteis
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              æqualeis diuiſam; pro initio verò ſpatij in longum de­
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              currendi, prout comparatur ad aream AKL in trian­
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              gulos æqualeis diſtinctam; ac pro initio velocitatis
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              continenter acquirendæ, prout comparatur cum linea
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              parteis æqualeis continuò adſciſcente, quovſque cœ­
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              pta à puncto A, euadat KL. </s>
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            <p type="main">
              <s id="s.000872">
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              Vt igitur punctum
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              A,
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              nunc habes pro initio temporis,
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              & parteis æqualeis
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              AE, EG, GI, IL,
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              pro partibus
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              æqualibus temporis; concipe etiam vicißim idem punctum
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              A
                <lb/>
                <emph type="italics"/>
              initium eſſe ſpatij, cuius parteis æqualeis æqualia item ſeg­
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              menta
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              AE, EG, GI, IL,
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              deſignent. </s>
              <s id="s.000873">Quo poſito, tam
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              </s>
            </p>
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