Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1hac figura tangentes illæ duæ evadent ſibi invicem parallelæ, & tan­
gens tertia fiet parallela rectæ per
56[Figure 56]
puncta duo data tranſeunti.
Sunto
hi, kltangentes illæ duæ parallelæ,
iktangens tertia, & hlrecta huic
parallela tranſiens per puncta illa
a, b,per quæ Conica ſectio in hac
figura nova tranſire debet, & pa­
rallelogrammum hiklcomplens.
Secentur rectæ hi, ik, klin c, d, e,
ita ut ſit hcad latus quadratum
rectanguli ahb, icad id,& ke
ad kdut eſt ſumma rectarum hi
& klad ſummam trium linea­
rum quarum prima eſt recta ik,& alteræ duæ ſunt latera quadrata
rectangulorum ahb& alb& erunt c, d, epuncta contactuum. Et­
enim, ex Conicis, ſunt hcquadratum ad rectangulum ahb,&
icquadratum ad idquadratum, & kequadratum ad kdquadratum,
& elquadratum ad rectangulum albin eadem ratione; & propter­
ea hcad latus quadratum ipſius ahb, icad id, kead kd,& elad
latus quadratum ipſius albſunt in ſubduplicata illa ratione, &
compoſite, in data ratione omnium antecedentium hi& klad
omnes conſequentes, quæ ſunt latus quadratum rectanguli ahb&
recta ik& latus quadratum rectanguli alb.Habentur igitur ex
data illa ratione puncta contactuum c, d, e,in figura nova. Per
inverſas operationes Lemmatis noviſſimi transferantur hæc pun­
cta in figuram primam & ibi, per Probl.
XIV, deſcribetur
Trajectoria. q.E.F.Ceterum perinde ut puncta a, bja­
cent vel inter puncta h, l,vel extra, debent puncta c, d, evel
inter puncta h, i, k, lcapi, vel extra. Si punctorum a, bal­
terutrum cadit inter puncta h, l,& alterum extra, Problema im­
poſſibile eſt.
DE MOTU
CORPORUM
PROPOSITIO XXVI. PROBLEMA XVIII.
Trajectoriam deſcribere quæ tranſibit per punctum datum & rectas
quatuor poſitione datas continget.
Ab interſectione communi duarum quarumlibet tangentium ad
interſectionem communem reliquarum duarum agatur recta infini-

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