Newton, Isaac, Philosophia naturalis principia mathematica, 1713
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              nihil: ſubducantur aliæ partes duæ, & fiet motus duarum partium
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              in plagam contrariam: & ſic de motu corporis
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              B
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              partium ſex ſub­
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              ducendo partes quatuordecim, fient partes octo in plagam contra­
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              riam. </s>
              <s>Quod ſi corpora ibant ad eandam plagam,
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              A
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              velocius cum
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              partibus quatuordecim, &
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              B
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              tardius cum partibus quinque, & poſt
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              reflexionem pergebat
                <emph type="italics"/>
              A
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              cum quinque partibus; pergebat
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              B
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              cum qua­
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              tuordecim, facta tranſlatione partium novem de
                <emph type="italics"/>
              A
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              in
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              B.
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              Et ſic
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              in reliquis. </s>
              <s>A congreſſu & colliſione corporum nunquam muta­
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              batur quantitas motus, quæ ex ſumma motuum conſpirantium &
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              differentia contrariorum colligebatur. </s>
              <s>Nam errorem digiti unius
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              & alterius in menſuris tribuerim difficultati peragendi ſingula
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              ſatis accurate. </s>
              <s>Difficile erat, tum pendula ſimul demittere fic, ut
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              corpora in ſe mutuo impingerent in loco infimo
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              AB
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              ; tum loca
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              s,
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              k
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              notare, ad quæ corpora aſcendebant poſt concurſum. </s>
              <s>Sed & in
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              ipſis pilis inæqualis partium denſitas, & textura aliis de cauſis irre­
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              gularis, errores inducebant. </s>
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            <p type="margin">
              <s>
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              LEGES
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              MOTUS</s>
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            <p type="main">
              <s>Porro nequis objiciat Regulam, ad quam probandam inventum
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              eſt hoc experimentum, præſupponere corpora vel abſolute dura
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              eſſe, vel ſaltem perfecte elaſtica, cujuſmodi nulla reperiuntur in
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              compoſitionibus naturalibus; addo quod Experimenta jam deſcrip­
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              ta ſuccedunt in corporibus mollibus æque ac in duris, nimirum a
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              conditione duritiei neutiquam pendentia. </s>
              <s>Nam ſi Regula illa in
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              corporibus non perfecte duris tentanda eſt, debebit ſolummodo
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              reflexio minui in certa proportione pro quantitate vis Elaſticæ. </s>
              <s>In
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              Theoria
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              Wrenni
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              &
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              Hugenii
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              corpora abſolute dura redeunt ab invi­
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              cem cum velocitate congreſſus. </s>
              <s>Certius id affirmabitur de perfecte
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              Elaſticis. </s>
              <s>In imperfecte Elaſticis velocitas reditus minuenda eſt ſi­
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              mul cum vi Elaſtica; propterea quod vis illa; (niſi ubi partes cor­
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              porum ex congreſſu læduntur, vel extenſionem aliqualem quaſi ſub
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              malleo patiuntur,) certa ac determinata ſit (quantum ſentio) faci­
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              atque corpora redire ab invicem cum velocitate relativa, quæ ſit ad
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              relativam velocitatem concurſus in data ratione. </s>
              <s>Id in pilis ex lana
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              arcte conglomerata & fortiter conſtricta ſic tentavi. </s>
              <s>Primum demit­
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              tendo Pendula & menſurando reflexionem, inveni quantitatem vis
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              Elaſticæ; deinde per hanc vim determinavi reflexiones in aliis ca­
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              ſibus concurſuum, & reſpondebant Experimenta. </s>
              <s>Redibant ſemper
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              pilæ ab invicem cum velocitate relativa, quæ eſſet ad velocitatem
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              relativam concurſus ut 5 ad 9 circiter. </s>
              <s>Eadem fere cum velocitate
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              redibant pilæ ex chalybe: aliæ ex ſubere cum paulo minore: in vi­
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              treis autem proportio erat 15 ad 16 circiter. </s>
              <s>Atque hoc pacto Lex
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              tertia quoad ictus & reflexiones per Theoriam comprobata eſt, quæ
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              cum experientia plane congruit. </s>
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