Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
DE MOTU
CORPORUM
SECTIO XIII.
De Corporum non Sphærieorum viribus attactivis.
PROPOSITIO LXXXV. THEOREMA XLII.
Si corporis attracti, ubi attrahenti contiguum est, attractio longe
fortior ſit, quam cum vel minimo intervallo ſeparantur ab in­
vicem: vires particularum trahentis, in receſſu corporis attrac­
ti, decreſcunt in ratione pluſquam duplicata diſtantiarum a
particulis.
Nam ſi vires decreſcunt in ratione duplicata diſtantiarum a par­
ticulis; attractio verſus corpus Sphæricum, propterea quod (per
Prop.
LXXIV) ſit reciproce ut quadratum diſtantiæ attracti corpo­
ris a centro Sphæræ, haud ſenſibiliter augebitur ex contactu; atque
adhuc minus augebitur ex contactu, ſi attractio in receſſu corporis
attracti decreſcat in ratione minore.
Patet igitur Propoſitio de
Sphæris attractivis.
Et par eſt ratio Orbium Sphærieorum conca­
vorum corpora externa trahentium.
Et multo magis res conſtat in
Orbibus corpora interius conſtituta trahentibus, cum attractiones
paſſim per Orbium cavitates ab attractionibus contrariis (per Prop.

LXX) tollantur, ideoque vel in ipſo contactu nullæ ſunt.
Quod
ſi Sphæris hiſce Orbibuſque Sphæricis partes quælibet a loco con­
tactus remotæ auferantur, & partes novæ ubivis addantur: mu­
tari poſſunt figuræ horum corporum attractivorum pro lubitu, nec
tamen partes additæ vel ſubductæ, cum ſint a loco contactus re­
motæ, augebunt notabiliter attractionis exceſſum qui ex contactu
oritur.
Conſtat igitur Propoſitio de corporibus Figurarum om­
nium. que E. D.

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