Fabri, Honoré
,
Tractatus physicus de motu locali
,
1646
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immò, & per lineam perpendicularem ſurſum, vel deorſum, & quò
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plùs contrahetur brachium, motus rectus per horizontalem erit maior; </
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ſit enim angulus cubiti ABO, ita vt BF ſit in BO; </
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">certè extremitas
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O percurret motu recto totam OP; </
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<
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">& ſi omninò contrahatur brachium,
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ita vt F ſit in A, percurret extremitas A totam rectam AP; </
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<
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id
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tem ictus eſt fortior, cum linea motus recti eſt maior; quippe ſingulis in
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ſtantibus nouus impetus accedit. </
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<
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">Tertiò, poteſt inueniri maximum ſpatium quod poteſt confici ab ex
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tremitate brachij motu recto; </
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">ſit enim centrum humeri immobile A,
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ſit AC os humeri, CD cubiti, ſit AD perpendicularis deorſum; </
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<
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angulus BAC maximæ deflexionis, qua os humeri poſſit retrò agi; </
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CGK, item DFO, ſit BG recta, BH æqualis CD; </
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">ducatur EHL
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perpendicularis ſurſum, ſitque CEOS cubiti: dico EL eſſe maximum
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ſpatium, &c. </
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<
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">cùm enim caput cubiti C poſſit tantùm retroagi in B; </
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">certè
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non poteſt extremitas D, in quocumque loco ſit, circuli DFO ſecare
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BG, in puncto quod propiùs accedat ad centrum A quàm H; </
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<
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">ſed om
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nium linearum, quæ poſſunt duci per H ſurſum perpendiculariter, ma
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xima eſt EL; </
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<
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id
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">immò EL eſt omnium maxima, quæ duci poſſunt poſita
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extremitate inter DE; </
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">vt autem habeatur omnium maxima; </
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<
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">ſit punctum
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K ſurſum, ad quod tantùm nodus, ſeu caput cubiti C peruenire poteſt; </
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aſſumatur KO æqualis CD, ex centro B fiat arcus AH, tùm ex O ad
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arcum AH; </
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">ducatur Tangens OQF; </
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<
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">certum eſt eſſe maximam lineam;
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quia accedit propiùs ad centrum A, vt conſtat. </
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">Quartò, poteſt pugnus ferire motu perfectè circulari, idque duobus
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modis. </
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">Primò, ſi brachium extenſum AD circa centrum moueatur per
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arcum DFO figura prima. </
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<
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">Secundò, ſi moueatur caput cubiti; </
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os humeri AB, & cubiti BC caput cubiti B; </
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tùm ex aliquo puncto ſuprà A, putà ex N radio NC fiat arcus CI; </
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aſſumpta AK æquali AB fiat arcus KH ſecans priorem in I; </
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">certè extre
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mitas C moueri poterit per arcum CI, donec brachium extentum ſit
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in AI, quod non eſt difficile; hîc porrò vides motum circularem ex
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duobus alijs circularibus mixtum. </
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<
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">Quintò, moueri per quamcumque aliam lineam curuam, ellipticam,
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parabolicam &c. </
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">immò per infinitas alias nouas; </
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<
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">vides nouam FDC,
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quæ vt fiat cubitus IF eſt ſemper ſibi ipſi parallelus; </
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<
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">quod vt fiat, caput
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I & extremitas F debent moueri æquali motu; </
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<
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FI æquales & parallelæ: </
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<
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">ex quo fit hanc curuam eſſe ſpeciem nouæ
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Conchoidis, de qua aliàs; mouetur autem initio tardiùs, & ſub
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finem velociùs, non quidem proprio motu circa centrum I, ſed motu
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mixto. </
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<
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id
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">Sextò, eſt maximus ictus inflictus à pugno, qui mouetur motu re
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cto per longiorem lineam, quæ accedit propiùs ad lineam brachij dein
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de extenti; </
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<
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">quò enim eſt longior linea producitur ſenſun maior impe
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tus; </
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<
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id
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">eſt enim motus naturaliter acceleratus, cùm ſit applicata con
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tinuô potentia motrix: </
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">præterea ictus eſt magis directus, ſi linea </
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