Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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1eoque pacto rarius ſemper evadens e regione intervallorum ac
denſius e regione pulſuum, participabit eorundem motum.
Et
quoniam pulſuum progreſſivus motus oritur a perpetua relaxa­
tione partium denſiorum verſus antecedentia intervalla rariora;
& pulſus eadem fere celeritate ſeſe in Medii partes quieſcentes
KL, NOhinc inde relaxare debent; pulſus illi eadem fere cele­
ritate ſeſe dilatabunt undiQ.E.I. ſpatia immota KL, NO,qua
propagantur directe a centro A; adeoque ſpatium totum KLON
occupabunt. Q.E.D.Hoc experimur in Sonis, qui vel monte
interpoſito audiuntur, vel in cubiculum per feneſtram admiſſi ſeſe
in omnes cubiculi partes dilatant, inque angulis omnibus audiun­
tur, non tam reflexi a parietibus oppoſitis, quam a feneſtra directe
propagati, quantum ex ſenſu judicare licet.
DE MOTU
CORPORUM
194[Figure 194]
Cas.3. Ponamus denique quod motus cujuſcunque generis
propagetur ab Aper foramen BC: & quoniam propagatio iſta
non fit, niſi quatenus partes Medii centro Apropiores urgent
commoventque partes ulteriores; & partes quæ urgentur fluidæ
ſunt, ideoque recedunt quaquaverſum in regiones ubi minus pre-

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