Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1
tium HG,deſcribendum a Cylindro
191[Figure 191]
cadente dum velocitatem ſuam ac­
quirit, ut HGad 1/2 AB.Sint etiam
CF& DFarcus alii duo Para­
bolici, axe CD& latere recto
quod ſit prioris lateris recti qua­
druplum deſcripti; & convolutione figuræ circum axem EFge­
neretur ſolidum cujus media pars ABDCſit Cylindrus de quo
agimus, & partes extremæ ABE& CDFcontineant partes fluidi
inter ſe quieſcentes & in corpora duo rigida concretas, quæ Cy­
lindro utrinque tanquam caput & cauda adhæreant.
Et ſolidi
EACFDB,ſecundum longitudinem axis ſui FEin partes ver­
ſus Eprogredientis, reſiſtentia ea erit quamproxime quam in hac
Propoſitione deſcripſimus, id eſt, quæ rationem illam habet ad
vim qua totus Cylindri motus, interea dum longitudo 4 ACmotu
illo uniformiter continuato deſcribatur, vel tolli poſſit vel generari,
quam denſitas Fluidi habet ad denſitatem Cylindri quamproxime.
Et hac vi Reſiſtentia minor eſſe non poteſt quam in ratione 2 ad 3,
per Corol. 7. Prop. XXXVI.
LEMMA V.
DE MOTU
CORPORUM.
Si Cylindrus, Sphæra & Sphærois, quorum latitudines ſunt æqua­
les, in medio canalis Cylindrici ita locentur ſucceſſive ut eo­
rum axes cum axe canalis coincidant: hæc corpora fluxum
aquæ per canalem æqualiter impedient.
Nam ſpatia inter Canalem & Cylindrum, Sphæram, & Sphæroi­
dem per quæ aqua tranſit, ſunt æqualia: & aqua per æqualia ſpa­
tia æqualiter tranſit.
LEMMA VI.
Iiſdem poſitis, corpora prædicta æqualiter urgentur ab aqua per
canalem fluente.
Patet per Lemma v & Motus Legem tertiam. Aqua utique &
corpora in ſe mutuo æqualiter agunt.

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