Render of Newton's Principia in XeLaTeX

newton.tex

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% Tim van Werkhoven (2010)
% newton.tex: Render of Newton's Principia in XeLaTeX
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illa \emph{BD}. Eodem argumento in fine temporis ejuſdem reperietur alicubi in linea \emph{CD}, \& idcirco in utriuſq; lineæ concurſu \emph{D} reperiri neceſſe eſt.
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    Corol.\ II.\\
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\hspace*{1em}\parbox{\textwidth-1em}{\emph{\hspace*{-1em}Et hinc patet compoſitio vis directæ AD ex viribus quibuſvis obliquis AB \& BD, \& viciſſim reſolutio vis cujuſvis directæ AD in obliquas quaſcunq; AB \& BD. Quæ quidem Compoſitio \& reſolutio abunde conſirmatur ex Mechanica.}}
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Ut ſi de rotæ alicujus centro O exeuntes radij inæquales \emph{OM},
\emph{ON} filis \emph{MA}, \emph{NP} ſuſtineant pondera \emph{A} \& \emph{P},
\& quærantur vires ponderum ad movendam rotam: per centrum O agatur
recta \emph{KOL} filis perpendiculariter occurens in \emph{K} \& \emph{L},
centroq; O \& intervallorum \emph{OK}, \emph{OL} majore \emph{OL}
deſcribatur circulus occurens filo \emph{MA} in \emph{D}: \& actæ rectæ
\emph{OD} parallela ſit \emph{AC} \& perpendicularis \emph{DC}. Quoniam nihil
refert utrum filorum puncta \emph{K}, \emph{L}, \emph{D} affixa ſint vel non
affixa ad planum rotæ, pondera idem valebunt ac ſi ſuſpenderentur a punctis
\emph{K} \& \emph{L} vel \emph{D} \& \emph{L}. Ponderis autem \emph{A}
exponatur vis tota per lineam \emph{AD}, \& hæc reſolvetur in vires \emph{AC},
\emph{CD}, quarum \emph{AC} trahendo radium \emph{OD} directe a centro nihil
valet ad movendam rotam; vis autem altera \emph{DC}, trahendo radium \emph{DO}
perpendiculariter, idem valet ac ſi perpendiculariter traheret radium
\emph{OL} ipſi \emph{OD} æqualem; hoc eſt idem atq; pondus \emph{P}, quod fit
ad pondus \emph{A} ut vis \emph{DC} ad vim \emph{DA}, id eſt (ob ſimilia triangula \emph{ADC}, \emph{DOK},) ut \emph{DO} (ſeu \emph{OL}) ad \emph{OK}. Pondera igitur \emph{A} \& \emph{P}, quæ ſunt reciproce ut radii in directum poſiti \emph{OK} \& \emph{OL}, idem pollebunt \& ſic conſiſtent in æquilibrio: (quæ eſt proprietas notiſſima Libræ,

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