Bošković, Ruđer Josip, Theoria philosophiae naturalis redacta ad unicam legem virium in natura existentium

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230. Sint in fig. 32 tria puncta AEB ita collocata, ut tres
22Elegans theoria
puncti
ſiti in
perimetro
elli-
pſis
binis aliis
occupantibus

foco
: ſuis nulla
in
verticibus
axium
.
diſtantiæ AB, AE, BE ſint diſtantiæ limitum cohæſionis, &

poſtremæ
duæ ſint æquales.
Focis A, B concipiatur ellipſis
tranſiens
per E, cujus axis transverſus ſit FO, conjugatus
EH
, centrum D:
ſit in fig. 1 AN æqualis ſemiaxi tranſ-
verſo
hujus DO, ſive BE, vel AE, ac ſit DB hic minor,
quam
in fig.
1 amplitudo proximorum arcuum LN, NP,
&
ſint in eadem fig. 1 arcus ipſi N M, NO ſimiles, & æqua-
les
ita, ut ordinatæ uy, zt, æque diſtantes ab N, ſint inter
33Fig. 1.
32
.
ſe æquales.
Inprimis ſi punctum materiæ ſit hic in E; nullam
ibi
habebit vim, cum A E, BE ſint æquales diſtantiæ AN li-
mitis
N figuræ 1;
ac eadem eſt ratio pro puncto collocato in
H
.
Quod ſi fuerit in O, itidem erit in æquilibrio. Si enim
aſſumantur
in fig.
1 A z, A u æquales hiſce BO, AO; erunt
N
z, N u illius æquales D B, DA hujus, adeoque &
inter ſe.
Quare & vires illius z t, u y erunt æquales inter ſe, quæ cum
pariter
oppoſitæ directionis ſint, ſe mutuo elident;
ac eadem
ratio
eſt pro collocatione in F.
Attrahetur hic utique A, &
repelletur
B ab O;
ſed ſi limes, qui reſpondet diſtantiæ AB,
ſit
ſatis validus;
ipſa puncta nihil ad ſenſum diſcedent a focis
ellipſeos
, in quibus fuerant collocata, vel ſi debeant diſcedere
ob
limitem minus validum, conſiderari poterunt per externam
vim
ibidem immota, ut contemplari liceat ſolam relationem
tertii
puncti ad illa duo.

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