Newton, Isaac, Philosophia naturalis principia mathematica, 1713
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                  tus ille celerius propagabitur per ſolum aerem verum, idQ.E.I.
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                  ſubduplicata ratione minoris materiæ. </s>
                  <s>Ut ſi Atmoſphæra con­
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                  ſtet ex decem partibus aeris veri & una parte vaporum, motus
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                  ſonorum celerior erit in ſubduplicata ratione 11 ad 10, vel in in­
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                  tegra circiter ratione 21 ad 20, quam ſi propagaretur per undecim
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                  partes aeris veri: ideoque motus ſonorum ſupra inventus, augen­
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                  dus erit in hac ratione. </s>
                  <s>Quo pacto ſonus, tempore minuti unius
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                  ſecundi, conficiet pedes 1142. </s>
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                  DE MOTU
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                  CORPORUM</s>
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                  <s>Hæc ita ſe habere debent tempore verno & autumnali, ubi aer
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                  per calorem temperatum rareſcit & ejus vis elaſtica nonnihil in­
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                  tenditur. </s>
                  <s>At hyberno tempore, ubi aer per frigus condenſatur,
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                  & ejus vis elaſtica remittitur, motus ſonorum tardior eſſe debet in
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                  ſubduplicata ratione denſitatis; & viciſſim æſtivo tempore debet
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                  eſſe velocior. </s>
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                  <s>Conſtat autem per experimenta quod ſoni tempore minuti uNI­
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                  us ſecundi eundo, conficiunt pedes
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                  Londinenſes
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                  plus minus 1142,
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                  Pariſienſes
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                  vero 1070. </s>
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                  <s>Cognita ſonorum velocitate innoteſcunt etiam intervalla pul­
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                  ſuum. </s>
                  <s>Invenit utique
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                  D. Sauveur
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                  (factis a ſe experimentis) quod
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                  fiſtula aperta, cujus longitudo eſt pedum
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                  Pariſienſium
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                  plus minus
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                  quinque, ſonum edit ejuſdem toni cum ſono chordæ quæ tempore
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                  minuti unius ſecundi centies recurrit. </s>
                  <s>Sunt igitur pulſus plus mi­
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                  nus centum in ſpatio pedum
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                  Pariſienſium
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                  1070, quos ſonus tem­
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                  pore minuti unius ſecundi percurrit; adeoque pulſus unus occu­
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                  pat ſpatium pedum
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                  Pariſienſium
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                  quaſi 10 (7/10), id eſt, duplam circi­
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                  ter longitudinem fiſtulæ. </s>
                  <s>Unde verſimile eſt quod latitudines
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                  pulſuum, in omnium apertarum fiſtularum ſonis, æquentur duplis
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                  longitudinibus fiſtularum. </s>
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                  <s>Porro cur ſoni ceſſante motu corporis ſonori ſtatim ceſſant, ne­
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                  Q.E.D.utius audiuntur ubi longiſſime diſtamus a corporibus ſono­
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                  ris, quam cum proxime abſumus, patet ex Corollario Propoſitio­
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                  nis XLVII Libri hujus. </s>
                  <s>Sed & cur ſoni in Tubis ſtenterophoNI­
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                  cis valde augentur, ex allatis principiis manifeſtum eſt. </s>
                  <s>Motus
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                  enim omnis reciprocus ſingulis recurſibus a cauſa generante augeri
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                  ſolet. </s>
                  <s>Motus autem in Tubis dilatationem ſonorum impedienti­
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                  bus, tardius amittitur & fortius recurrit, & propterea a motu
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                  novo ſingulis recurſibus impreſſo, magis augetur. </s>
                  <s>Et hæc ſunt
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                  præcipua Phænomena Sonorum. </s>
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