Fabri, Honoré, Tractatus physicus de motu locali, 1646

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              tioris ſthomachi rationem hanc negatiuam, cum tanta nauſea reſpuant,
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              cum optima ſit; </s>
              <s id="N1F78F">nec vlli fallaciæ ſubiiciatur, non tamen ſolitariam eſſe
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              oportuit; quippe effectus poſitiuus per principium poſitiuum ad ſuam
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              cauſam reducendus eſt. </s>
            </p>
            <p id="N1F797" type="main">
              <s id="N1F799">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              34.
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              </s>
            </p>
            <p id="N1F7A5" type="main">
              <s id="N1F7A7">
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              Hinc vides eſſe ſemper quatuor angulos æquales,
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              ſcilicet, angulum inci­
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              dentiæ, angulum reflexionis & duos his oppoſitos; allos verò quatuor
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              etiam inter ſe æquales, ſcilicet duos angulos complementi & duos his
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              oppoſitos. </s>
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            <p id="N1F7B6" type="main">
              <s id="N1F7B8">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              35.
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              </s>
            </p>
            <p id="N1F7C4" type="main">
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              Hinc quoque reiicies illos, qui nolunt in reflexione impetum produci in mo­
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              bili à plano reflectente
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              ; quod reuerâ, ſi fieret nulla eſſet ratio æqualitatis
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              angulorum incidentiæ, & reflexionis, reiicies quoque aliquos apud Mer­
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              ſennum in phænom. </s>
              <s id="N1F7D5">Balliſt. prop. 24. qui ponunt duo qualitatum gene­
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              ra, quarum aliæ mobile firmiter affigant plano, aliæ à plano remoueant,
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              quod pluſquàm ridiculum eſt; </s>
              <s id="N1F7DF">itemque alios ibidem, qui nolunt circa
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              punctum reflexionis ab impreſſione mobilis foſſulam fieri, ſed non ſine
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              compreſſione, cuius deinde vi repellitur idem mobile; </s>
              <s id="N1F7E7">ſed in duro mar­
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              more nullum omninò apparet veſtigium huius foſſulæ, adde quod ſi hoc
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              eſſet, ſemper reflexio fieret per ipſam perpendicularem; </s>
              <s id="N1F7EF">quod vero perti­
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              net ad illas qualitates magneticas, quarum aliæ retinent, aliæ repellunt
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              mobile, pœnitus in hoc caſu inſulſæ ſunt; </s>
              <s id="N1F7F7">alioqui etiam ſine motu præ­
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              uio repellerent: vtrum verò in magnete admittendæ ſint, fusè diſputa­
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              bimus ſuo loco. </s>
            </p>
            <p id="N1F7FF" type="main">
              <s id="N1F801">
                <emph type="center"/>
                <emph type="italics"/>
              Theorema
                <emph.end type="italics"/>
              36.
                <emph.end type="center"/>
              </s>
            </p>
            <p id="N1F80D" type="main">
              <s id="N1F80F">
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              Ex hac angulorum æqualitate tùm Captotrica infinita ferè Theoremata de­
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              monstrat in radiis viſilibus, in ſpeculis vſtoriis, tùm Echometria in reflexione
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              ſonorum.
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              </s>
              <s id="N1F81A"> Et verò noua Catoptrica poteſt eſſe in motu, quæ eadem pror­
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              ſus demonſtrabit, tùm in ſpeculis parabolicis, à quibus omnia miſſilia
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              projecta per parallelas axi Parabolæ in idem punctum reflectentur; </s>
              <s id="N1F822">vel
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              Ellipticis, à quibus omnia miſſilia projecta à dato puncto per omnes li­
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              neas ad idem punctum reflectentur; </s>
              <s id="N1F82A">vel Hyperbolicis, à quibus miſſilia
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              projecta per plures lineas ad idem punctum ad aliud punctum omnes re­
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              flectuntur; </s>
              <s id="N1F832">vel Sphæricis concauis, à quibus miſſilia projecta per plures
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              lineas decuſſatas in eodem puncto ad idem punctum reflectuntur; vel
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              Sphæricis conuexis, à quibus miſſile proiectum à quolibet puncto dato
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              ad quodlibet aliud datum reflectitur. </s>
              <s id="N1F83C">Ratio eſt, quia in circulo ſunt om­
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              nia plana; </s>
              <s id="N1F842">quælibet enim Tangens planum eſt; ſiue denique in Cylin­
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              dricis, Conicis, &c. </s>
              <s id="N1F848">quæ omnia ex principiis Catoptricis demonſtrari
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              poſſunt: </s>
              <s id="N1F84E">adde ſi vis in hac Catoptrica verſatos eſſe debere, qui pilâ lu­
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              dunt, quos nunquam falleret ictus, ſi hanc rationem angulorum non mo­
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              dò perfectè callerent, verùm etiam ad praxim reducerent: immò poſſet
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              eſſe aliqua portio muri talis figuræ, vt ſemper inde reflexa pila per da­
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              tum cuniculum rectà traiiceretur. </s>
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