Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                  æquilibrio cum fluidi partibus conſtitutum, urgetur; & comparari
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                  poteſt cum exceſſu vel defectu ponderis in lance alterutra libræ. </s>
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                  DE MOTU
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                  CORPORUM</s>
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                  Corol.
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                  6. Corporum igitur in fluidis conſtitutorum duplex eſt Gra­
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                  vitas: altera vera & abſoluta, altera apparens, vulgaris & compa­
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                  rativa. </s>
                  <s>Gravitas abſoluta eſt vis tota qua corpus deorſum tendit:
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                  relativa & vulgaris eſt exceſſus gravitatis quo corpus magis tendit
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                  deorſum quam fluidum ambiens. </s>
                  <s>Prioris generis Gravitate partes
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                  fluidorum & corporum omnium gravitant in locis ſuis: ideoque
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                  conjunctis ponderibus componunt pondus totius. </s>
                  <s>Nam totum
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                  omne grave eſt, ut in vaſis liquorum plenis experiri licet; & pon­
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                  dus totius æquale eſt ponderibus omnium partium, ideoque ex iiſ­
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                  dem componitur. </s>
                  <s>Alterius generis Gravitate corpora non gravi­
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                  tant in locis ſuis, id eſt, inter ſe collata non prægravant, ſed mu­
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                  tuos ad deſcendendum conatus impedientia permanent in locis
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                  ſuis, perinde ac ſi gravia non eſſent. </s>
                  <s>Quæ in Aere ſunt & non
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                  prægravant, vulgus gravia non judicat. </s>
                  <s>Quæ prægravant vulgus
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                  gravia judicat, quatenus ab Aeris pondere non ſuſtinentur. </s>
                  <s>Pon­
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                  dera vulgi nihil aliud ſunt quam exceſſus verorum ponderum ſu­
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                  pra pondus Aeris. </s>
                  <s>Unde & vulgo dicuntur levia, quæ ſunt mi­
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                  nus gravia, Aerique prægravanti cedendo ſuperiora petunt. </s>
                  <s>Com­
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                  parative levia ſunt, non vere, quia deſcendunt in vacuo. </s>
                  <s>Sic &
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                  in Aqua, corpora, quæ ob majorem vel minorem gravitatem de­
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                  ſcendunt vel aſcendunt, ſunt comparative & apparenter gravia vel
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                  levia, & eorum gravitas vel levitas comparativa & apparens eſt ex­
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                  ceſſus vel defectus quo vera eorum gravitas vel ſuperat gravita­
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                  tem aque vel ab ea ſuperatur. </s>
                  <s>Quæ vero nec prægravando de­
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                  ſcendunt, nec prægravanti cedendo aſcendunt, etiamſi veris ſuis
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                  ponderibus adaugeant pondus totius, comparative tamen & in ſen­
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                  ſu vulgi non gravitant in aqua. </s>
                  <s>Nam ſimilis eſt horum Caſuum
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                  Demonſtratio. </s>
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                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Corol.
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                  7. Quæ de gravitate demonſtrantur, obtinent in aliis qui­
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                  buſcunque viribus centripetis. </s>
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                  <s>
                    <emph type="italics"/>
                  Corol.
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                  8. Proinde ſi Medium, in quo corpus aliquod movetur,
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                  urgeatur vel a gravitate propria, vel ab alia quacunque vi centri­
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                  peta, & corpus ab eadem vi urgeatur fortius: differentia virium
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                  eſt vis illa motrix, quam in præcedentibus Propoſitionibus ut vim
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                  centripetam conſideravimus. </s>
                  <s>Sin corpus a vi illa urgeatur levius,
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                  differentia virium pro vi centrifuga haberi debet. </s>
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                <p type="main">
                  <s>
                    <emph type="italics"/>
                  Corol.
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                  9. Cum autem fluida premendo corpora incluſa non
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                  mutent eorum Figuras externas, patet inſuper, per Corollarium </s>
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