Marci of Kronland, Johannes Marcus, De proportione motus figurarum recti linearum et circuli quadratura ex motu, 1648

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              PARS TERTIA.
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              <s>
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              DE MOTV REFLEXO FIGVR ARVM
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              RECTILINEARVM.
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              E gi de motu reflexo in lib: de proport: motûs, à prop: 36. ad 40. ve­
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              rùm hunc non niſi in circulo expendi. </s>
              <s>Licet verò in Quadraturâ cir­
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              culi motus quo〈que〉 reſtexus interueniat; dum ab illatâ plagâ aliò, quàm
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              ferebatur, viam capeßit: hic tamen unà hypomochlium mouetur: ne〈que〉
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              huius principium eſt grauitas. </s>
              <s>Neceſſe ergo in figuris quo〈que〉 rectilineis
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              hunc motum reflexum, quatenus à grauitate & hypomochlio immoto
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              procedit, conſidexare.
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              THEOREMA I.
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              Motus trianguli Iſogoni ad planum & baſim perpendicularis, in
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              ſe ipſum reflectit.
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              <s>TRiangulo
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              abc
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              labenti occurrat planum
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              az:
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                <expan abbr="ſitq;">ſitque</expan>
              motus
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              centri
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              d
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              ad illud planum, & baſim
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              ab
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              perpendicularis
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              dico hunc motum in ſe ipſum reflecti. </s>
              <s>Nam in primâ quidem
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              figurâ motus centri
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              huius plaga eſt in eadem lineâ
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              dc:
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              da­
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              bit ergo plagam perfectam. & quia per eandem lineam
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              dc
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              re­
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              cipit à percuſſo æqualem illi, quam dedit plagam per 5 theor:
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              2 partis, motus in ſe ipſum reflectit. </s>
              <s>In ſecundâ autem figurâ
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              percuſſio fit per idem theor. per lineas
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              da, df, db;
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              eſtq motus
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              centri in lineâ
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              df:
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              erit ergo motus reflexus à plagâ
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              df
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              in ea­
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              dem lineâ
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              df.
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              at verò plaga in
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              ad
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              &
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              bd
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              centrum
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              d
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              reper­
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              cuſſum in partes agit
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              dg. de.
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              & quia plaga in
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              da
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              eſt æqualis </s>
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