Bernoulli, Daniel, Hydrodynamica, sive De viribus et motibus fluidorum commentarii

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3824HYDRODYNAMICÆ. potentias utcunque variabiles, quarum altera ſit ubique ad curvam, altera
ad
A G perpendicularis:
priorem ponemus in puncto D æqualem A, in
puncto
E æqualem A + dA, alteram in puncto D = C, in puncto E = C + dC:
Sit porro AB = x, BD = y, AD = s, BC = dx, FE = dy, DE = ds, quod
elementum
curvæ conſtantis magnitudinis ponatur;
Radius Oſculi in puncto
D
= R, in puncto E = R + dR.
Dico æquationem ad curvam fore hanc - AdR
-
R d A = (RdCdx + 2Cdyds + CdxdR) ds, vel poſito CRddx pro Cdyds
(eſt enim R = {dyds/ddx}) habebitur - AdR - RdA = (RdCdx + CRdds + Cdyds
+ Cdx dR):
ds, ſive {-ARds - RCdx/dx} = ſCdy.

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