Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
LIBER
PRIMUS.
PROPOSITIO LXXXVI. THEOREMA XLIII.
Si particularum, ex quibus corpus attractivum componitur, vires
in receſſu corporis attracti decreſcunt in triplicata vel pluſquam
triplicata ratione diſtantiarum a particulis: attractio longe for­
tior erit in contactu, quam cum attrahens & attractum inter­
vallo vel minimo ſeparantur ab invicem.
Nam attractionem in acceſſu attracti corpuſculi ad hujuſmodi
Sphæram trahentem augeri in infinitum, conſtat per ſolutionem Pro­
blematis XLI, in Exemplo ſecundo ac tertio exhibitam.
Idem, per
Exempla illa & Theorema XLI inter ſe collata, facile colligitur
de attractionibus corporum verſus Orbes concavo-convexos, ſive
corpora attracta collocentur extra Orbes, ſive intra in eorum cavi­
tatibus.
Sed & addendo vel auferendo his Sphæris & Orbibus ubi­
vis extra locum contactus materiam quamlibet attractivam, eo ut
corpora attractiva induant figuram quamvis aſſignatam, conſtabit
Propoſitio de corporibus univerſis. que E. D.
PROPOSITIO LXXXVII. THEOREMA XLIV.
Si corpora duo ſibi invicem ſimilia, & ex materia æqualiter attra­
ctiva conſtantia, ſeorſim attrahant corpuſcula ſibi ipſis proporti­
onalia & ad ſe ſimiliter poſita: attractiones acceleratrices cor­
puſculorum in corpora tota erunt ut attractiones acceleratrices
corpuſculorum in eorum particulas totis proportionales & in to­
tis ſimiliter poſitas.
Nam ſi corpora diſtinguantur in particulas, quæ ſint totis pro­
portionales & in totis ſimiliter ſitæ; erit, ut attractio in particulam
quamlibet unius corporis ad attractionem in particulam correſpon­
dentem in corpore altero, ita attractiones in particulas ſingulas
primi corporis ad attractiones in alterius particulas ſingulas correſ­
pondentes; & componendo, ita attractio in totum primum corpus
ad attractionem in totum ſecundum. que E. D.
Corol.1. Ergo ſi vires attractivæ particularum, augendo diſtan­
tias corpuſculorum attractorum, decreſcant in ratione dignitatis

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