Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1tervallo ADdeſcribitur, trahunt corpus Pverſus A,eſt ut area
tota AHIKLducta in AP. que E. D.
LIBER
PRIMUS.
Corol.1. Hinc ſi vires punctorum decreſcunt in duplicata di­
ſtantiarum ratione, hoc eſt, ſi ſit FKut (1/PFquad.), atque adeo a­
rea AHIKLut (1/PA-1/PH); erit attractio corpuſculi Pin Circu­
lum ut (1-PA/PH), id eſt, ut (AH/PH).
Corol.2. Et univerſaliter, ſi vires punctorum ad diſtantias D ſint
reciproce ut diſtantiarum dignitas quælibet Dn, hoc eſt, ſi ſit FK
ut (1/Dn), adeoque area AHIKLut (1/PAn-1-1/PHn-1); erit attra­
ctio corpuſculi Pin Circulum ut (1/PAn-2-PA/PHn-1).
Corol3. Et ſi diameter Circuli augeatur in infinitum, & nume­
rus nſit unitate major; attractio corpuſculi Pin planum totum
infinitum erit reciproce ut PAn-2,propterea quod terminus al­
ter (PA/PHn-1) evaneſcet.
PROPOSITIO XCI. PROBLEMA XLV.
Invenire attractionem corpuſculi ſiti in axe Solidi rotundi, ad cujus
puncta ſingula tendunt vires æquales centripetæ in quacunque
diſtantiarum ratione decreſcentes.
In Solidum ADEFGtra­
128[Figure 128]
hatur corpuſculum P,ſitum in
ejus axe AB.Circulo quoli­
bet RFSad hunc axem per­
pendiculari ſecetur hoc Solidum,
& in ejus diametro FS,in pla­
no aliquo PALKBper axem
tranſeunte, capiatur (per Prop.

XC) longitudo FKvi qua cor­
puſculum Pin circulum illum
attrahitur proportionalis.
Tangat autem punctum Kcurvam line­
am LKI,planis extimorum circulorum AL& BIoccurrentem in
L& I; & erit attractio corpuſculi Pin Solidum ut area LABI.
que E. I.

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