Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1vis qua planum quodvis mHMtrahit punctum Ceſt reciproce ut
CHn-2.In plano mHMcapiatur longitudo HMipſi CHn-2re­
ciproce proportionalis, & erit vis illa ut HM.Similiter in planis ſin­
gulis lGL, nIN, oKO,&c. capiantur longitudines GL, IN, KO,&c.
ipſis CGn-2, CIn-2, CKn-2,&c. reciproce proportionales; & vi­
res planorum eorundem erunt ut longitudines captæ, adeoque
ſumma virium ut ſumma longitudinum, hoc eſt, vis Solidi totius ut
area GLOKin infinitum verſus OKproducta. Sed area illa (per
notas quadraturarum methodos) eſt reciproce ut CGn-3,& prop­
terea vis Solidi totius eſt reciproce ut CGn-3. que E. D.
LIBER
PRIMUS.
Cas.2. Collocetur jam corpuſculum Cex parte plani lGLin­
tra Solidum, & capiatur diſtantia CKæqualis diſtantiæ CG.Et So­
lidi pars LGloKO,planis parallelis lGL, oKOterminata, cor­
puſculum Cin medio ſitum nullam in partem trahet, contrariis op­
poſitorum punctorum actionibus ſe mutuo per æqualitatem tollenti­
bus.
Proinde corpuſculum Cſola vi Solidi ultra planum OKſiti tra­
hitur.
Hæc autem vis (per Caſum primum) eſt reciproce ut CKn-3,
hoc eſt (ob æquales CG, CK) reciproce ut CGn-3. que E. D.
Corol.1. Hinc ſi Solidum LGINplanis duobus infinitis pa­
rallelis LG, INutrinque terminetur; innoteſcit ejus vis attra­
ctiva, ſubducendo de vi attractiva Solidi totius infiniti LGKO
vim attractivam partis ulterioris NICO,in infinitum verſus KO
productæ.
Corol.2. Si Solidi hujus infiniti pars ulterior, quando attractio e­
jus collata cum attractione partis citerioris nullius pene eſt momen­
ti, rejiciatur: attractio partis illius citerioris augendo diſtantiam de­
creſcet quam proxime in ratione poteſtatis CGn-3.
Corol.3. Et hinc ſi corpus quodvis finitum & ex una parte pla­
num trahat corpuſculum e regione medii illius plani, & diſtantia
inter corpuſculum & planum collata cum dimenſionibus corpo­
ris attrahentis perexigua ſit, conſtet autem corpus attrahens ex
particulis homogeneis, quarum vires attractivæ decreſcunt in
ratione poteſtatis cujuſvis pluſquam quadruplicatæ diſtantiarum;
vis attractiva corporis totius decreſcet quamproxime in ratione
poteſtatis, cujus latus ſit diſtantia illa perexigua, & Index terna­
rio minor quam Index poteſtatis prioris.
De corpore ex particulis
conſtante, quarum vires attractivæ decreſcunt in ratione poteſtatis
triplicatæ diſtantiarum, aſſertio non valet; propterea quod, in hoc
caſu, attractio partis illius ulterioris corporis infiniti in Corollario
ſecundo, ſemper eſt infinite major quam attractio partis citerioris.

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