Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
Reg.1. Si ſervetur tum Medii denſitas in A,tum velocitas qua­
cum corpus projicitur, & mutetur angulus NAH; manebunt lon­
gitudines AH, AI, HX.Ideoque ſi longitudines illæ in aliquo
caſu inveniantur, Hyperbola deinceps ex dato quovis angulo NAH
expedite determinari poteſt.
LIBER
SECUNDUS.
Reg.2. Si ſervetur tum angulus NAH,tum Medii denſitas
in A,& mutetur velocitas quacum corpus projicitur; ſervabitur
longitudo AH,& mutabitur AIin duplicata ratione velocitatis
reciproce.
Reg.3. Si tam angulus NAHquam corporis velocitas in A,
gravitaſque acceleratrix ſervetur, & proportio reſiſtentiæ in Aad
156[Figure 156]
gravitatem motricem augeatur in ratione quacunque: augebitur
proportio AHad AIin eadem ratione, manente Parabolæ late­
re recto, eique proportionali longitudine (AHq/AI); & propterea mi­
nuetur AHin eadem ratione, & AIminuetur in ratione illa du­
plicata.
Augetur vero proportio reſiſtentiæ ad pondus, ubi vel gra­
vitas ſpecifica ſub æquali magnitudine fit minor, vel Medii denſi­
tas major, vel reſiſtentia, ex magnitudine diminuta, diminuitur in
minore ratione quam pondus.

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