Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  muntur: recedent eædem verſus Medii partes omnes quieſcentes,
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                  tam laterales
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                  KL
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                  &
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                  NO,
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                  quam anteriores
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                  PQ,
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                  eoque pacto
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                  motus omnis, quam primum per foramen
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                  BC
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                  tranſiit, dilatari in­
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                  cipiet & abinde, tanquam a principio & centro, in partes omnes
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                  directe propagari.
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                  Q.E.D.
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                  LIBER
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                  SECUNDUS.</s>
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                  PROPOSITIO XLIII. THEOREMA XXXIV.
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                  Corpus omne tremulum in Medio Elaſtico propagabit motum pul­
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                  ſuum undiQ.E.I. directum; in Medio vero non Elaſtico motum
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                  circularem excitabit.
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                  Cas.
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                  1. Nam partes corporis tremuli vicibus alternis eundo &
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                  redeundo, itu ſuo urgebunt & propellent partes Medii ſibi proxi­
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                  mas, & urgendo compriment eaſdem & condenſabunt; dein re­
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                  ditu ſuo ſinent partes compreſſas recedere & ſeſe expandere. </s>
                  <s>Igi­
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                  tur partes Medii corpori tremulo proximæ ibunt & redibunt per
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                  vices, ad inſtar partium corporis illius tremuli: & qua ratione
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                  partes corporis hujus agitabant haſce Medii partes, hæ ſimilibus
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                  tremoribus agitatæ agitabunt partes ſibi proximas, eæque ſimiliter
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                  agitatæ agitabunt ulteriores, & ſic deinceps in infinitum. </s>
                  <s>Et
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                  quemadmodum Medii partes primæ eundo condenſantur & re­
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                  deundo relaxantur, ſic partes reliquæ quoties eunt condenſabun­
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                  tur, & quoties redeunt ſeſe expandent. </s>
                  <s>Et propterea non omnes
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                  ibunt & ſimul redibunt (ſic enim determinatas ab invicem diſtan­
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                  tias ſervando, non rarefierent & condenſarentur per vices) ſed ac­
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                  cedendo ad invicem ubi condenſantur, & recedendo ubi rarefiunt,
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                  aliquæ earum ibunt dum aliæ redeunt; idque vicibus alternis in
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                  infinitum. </s>
                  <s>Partes autem euntes & eundo condenſatæ, ob motum
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                  ſuum progreſſivum quo feriunt obſtacula, ſunt pulſus; & propte­
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                  rea pulſus ſucceſſivi a corpore omni tremulo in directum propaga­
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                  buntur; idque æqualibus circiter ab invicem diſtantiis, ob æqua­
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                  lia temporis intervalla, quibus corpus tremoribus ſuis ſingulis
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                  ſingulos pulſus excitat. </s>
                  <s>Et quanquam corporis tremuli par­
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                  tes eant & redeant ſecundum plagam aliquam certam & determi­
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                  natam, tamen pulſus inde per Medium propagati ſeſe dilatabunt
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                  ad latera, per Propoſitionem præcedentem; & a corpore illo tre­
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                  mulo tanquam centro communi, ſecundum ſuperficies propemo­
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                  dum ſphæricas & concentricas, undique propagabuntur. </s>
                  <s>Cujus </s>
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