Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1tas O, & erit hæc ſuperficies (per de­
125[Figure 125]
monſtrata Archimedis) ut PFXDFXO.
Ponamus præterea vires attractivas par­
ticularum Sphæræ eſſe reciproce ut
diſtantiarum dignitas illa cujus Index
eſt n; & vis qua ſuperficies FEtrahit
corpus Perit ut (DFXO/PFn-1). Huic pro­
portionale ſit perpendiculum FNduc­
tum in O; & area curvilinea BDLIB,
quam ordinatim applicata FNin lon­
gitudinem DBper motum continuum
ducta deſcribit, erit ut vis tota qua
Segmentum totum RBSDtrahit corpus P. que E. I.
LIBER
PRIMUS.
PROPOSITIO LXXXIV. PROBLEMA XLIII.
Invenire vim qua corpuſculum, extra centrum Sphæræ in axe Seg­
menti cujuſvis locatum, attrahitur ab eodem Segmento.
A Segmento EBKtrahatur corpus P(Vide Fig. Prop. LXXIX,
LXXX, LXXXI) in ejus axe ADBlocatum. Centro Pinterval­
lo PEdeſcribatur ſuperficies Sphærica EFK,qua diſtinguatur
Segmentum in partes duas EBKF& EFKD.Quæratur vis par­
tis prioris per Prop.
LXXXI, & vis partis poſterioris per Prop.
LXXXIII; & ſumma virium erit vis Segmenti totius EBKD.
que E. I.
Scholium.
Explicatis attractionibus corporum Sphærieorum, jam pergere
liceret ad Leges attractionum aliorum quorundam ex particulis at­
tractivis ſimiliter conſtantium corporum; ſed iſta particulatim
tractare minus ad inſtitutum ſpectat.
Suffecerit Propoſitiones
quaſdam generaliores de viribus hujuſmodi corporum, deque mo­
tibus inde oriundis, ob earum in rebus Philoſophicis aliqualem
uſum, ſubjungere.

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