Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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In hac Propoſitione reſiſtentiam inveſtigavimus quæ oritur a
ſola magnitudine tranſverſæ ſectionis Cylindri, neglecta reſiſtentiæ
parte quæ ab obliquitate motuum oriri poſſit.
Nam quemadmo­
dum
in caſu primo Propoſitionis XXXVI, obliquitas motuum qui­
bus
partes aquæ in vaſe, undique convergebant in foramen EF,
impedivit
effluxum aquæ illius per foramen: ſic in hac Propoſiti­
one
, obliquitas motuum quibus partes aquæ ab anteriore Cylindri
termino preſſæ, cedunt preſſioni & undiQ.E.D.vergunt, retardat eo­
rum
tranſitum per loca in circuitu termini illius antecedentis ver­
ſus
poſteriores partes Cylindri, efficitque ut fluidum ad majorem
diſtantiam commoveatur & reſiſtentiam auget, idQ.E.I. ea fere
ratione qua effluxum aquæ e vaſe diminuit, id eſt, in ratione du­
plicata
25 ad 21 circiter.
Et quemadmodum, in Propoſitionis illius
caſu primo, effecimus ut partes aquæ perpendiculariter & maxima
copia tranſirent per foramen EF,ponendo quod aqua omnis in
vaſe quæ in circuitu cataractæ congelata fuerat, & cujus motus
obliquus erat & inutilis, maneret ſine motu: ſic in hac Propoſi­
tione
, ut obliquitas motuum tollatur, & partes aquæ motu maxime
directo & breviſſimo cedentes facillimum præbeant tranſitum Cy­
lindro
, & ſola maneat reſiſtentia quæ oritur a magnitudine ſecti­
onis
tranſverſæ, quæQ.E.D.minui non poteſt niſi diminuendo dia­
metrum
Cylindri, concipiendum eſt quod partes fluidi quarum
motus ſunt obliqui & inutiles & reſiſtentiam creant, quieſcant in­
ter
ſe ad utrumque Cylindri ter­
190[Figure 190]
minum
, & cohæreant & Cylindro
jungantur.
Sit ABCDrectan­
gulum
, & ſint AE& BEarcus
duo Parabolici axe ABdeſcripti,
latere autem recto quod ſit ad ſpa-

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