Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1Prop. XIX, quod non mutabunt ſitum partium internarum inter
ſe: proindeque, ſi Animalia immergantur, & ſenſatio omnis a mo­
tu partium oriatur; nec lædent corpora immerſa, nec ſenſatio­
nem ullam excitabunt, niſi quatenus hæc corpora a compreſſione
condenſari poſſunt.
Et par eſt ratio cujuſcunque corporum Sy­
ſtematis fluido comprimente circundati.
Syſtematis partes omnes
iiſdem agitabuntur motibus, ac ſi in vacuo conſtituerentur, ac ſo­
lam retinerent gravitatem ſuam comparativam, niſi quatenus flui­
dum vel motibus earum nonnihil reſiſtat, vel ad eaſdem compreſſi­
one conglutinandas requiratur.
LIBER
SECUNDUS.
PROPOSITIO XXI. THEOREMA XVI.
Sit Fluidi cujuſdam denſitas compreſſioni proportionalis, & partes
ejus a vi centripeta diſtantiis ſuis a centro reciproce proportio­
nali deorſum trabantur: dico quod, fi diſtantiæ illæ ſumantur
continue proportionales, denſitates Fluidi in iiſdem diſtantiis e­
runt etiam continue proportionales.
Deſignet ATVfundum Sphæricum cui fluidum incumbit, S
centrum, SA, SB, SC, SD, SE,&c. diſtantias continue propor­
tionales.
Erigantur perpendicula AH, BI, CK, DL, EM, &c.
quæ ſint ut denſitates Medii in locis A, B, C, D, E; & ſpecificæ
gravitates in iiſdem locis erunt ut (AH/AS), (BI/BS), (CK/CS),&c. vel, quod
perinde eſt, ut (AH/AB), (BI/BC), (CK/CD),&c. Finge pri­
170[Figure 170]
mum has gravitates uniformiter continuari ab
Aad B,a Bad C,a Cad D,&c. factis per
gradus decrementis in punctis B, C, D,&c. Et
hæ gravitates ductæ in altitudines AB, BC,
CD,&c.
conficient preſſiones AH, BI, CK,
quibus fundum ATV(juxta Theorema XV.)
urgetur.
Suſtinet ergo particula Apreſſiones
omnes AH, BI, CK, DL,pergendo in
infinitum; & particula Bpreſſiones omnes
præter primam AH; & particula Comnes
præter duas primas AH, BI; & ſic deinceps: adeoque parti­
culæ primæ Adenſitas AHeſt ad particulæ ſecundæ Bdenſi-

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