Newton, Isaac, Philosophia naturalis principia mathematica, 1713

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                    <pb xlink:href="039/01/320.jpg" pagenum="292"/>
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                    <arrow.to.target n="note268"/>
                  dubio magis reſiſtunt quam liquidiora, ut Oleum frigidum quam
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                  calidum, calidum quam aqua pluvialis, aqua quam Spiritus Vini.
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                  Verum in liquoribus qui ad ſenſum ſatis fluidi ſunt, ut in Aere, in
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                  Aqua ſeu dulci ſeu ſalſa, in Spiritibus Vini, Terebinthi & Salium,
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                  in Oleo a fæcibus per deſtillationem liberato & calefacto, Oleoque
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                  Vitrioli & Mercurio, ac Metallis liquefactis, & ſiqui ſint alii, qui
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                  tam fluidi ſunt ut in vaſis agitati motum impreſſum diutius con­
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                  ſervent, effuſique liberrime in guttas decurrendo reſolvantur, nul­
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                  lus dubito quin regula allata ſatis accurate obtineat: præſertim ſi
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                  experimenta in corporibus pendulis & majoribus & velocius motis
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                  inſtituantur.
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                <p type="margin">
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                    <margin.target id="note268"/>
                  DE MOTU
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                  CORPORUM</s>
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                <p type="main">
                  <s>Denique cum receptiſſima Philoſophorum ætatis hujus opinio
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                  ſit, Medium quoddam æthereum & longe ſubtiliſſimum extare,
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                  quod omnes omnium corporum poros & meatus liberrime per­
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                  meet; a tali autem Medio per corporum poros fluente reſiſtentia
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                  oriri debeat: ut tentarem an reſiſtentia, quam in motis corporibus
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                  experimur, tota ſit in eorum externa ſuperficie, an vero partes eti­
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                  am internæ in ſuperficiebus propriis reſiſtentiam notabilem ſenti­
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                  ant, excogitavi experimentum tale. </s>
                  <s>Filo pedum undecim longitu­
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                  dinis, ab unco chalyoeo ſatis firmo, mediante annulo chalybeo, ſu­
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                  ſpendebam pyxidem abiegnam rotundam, ad conſtituendum pen­
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                  dulum longitudinis prædictæ. Uncus ſurſum præacutus erat acie
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                  concava, ut annulus arcu ſuo ſuperiore aciei innixus liberrime mo­
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                  veretur. </s>
                  <s>Arcui autem inferiori annectebatur filum. </s>
                  <s>Pendulum ita
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                  conſtitutum deducebam a perpendiculo ad diſtantiam quaſi pedum
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                  ſex, idque ſecundum planum aciei unci perpendiculare, ne annu­
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                  lus, oſcillante pendulo, ſupra aciem unci ultro citroque laberetur.
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                  Nam punctum ſuſpenſionis, in quo annulus uncum tangit, immo­
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                  tum manere debet. </s>
                  <s>Locum igitur accurate notabam, ad quem de­
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                  duxeram pendulum, dein pendulo demiſſo notabam alia tria loca ad
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                  quæ redibat in fine oſcillationis primæ, ſecundæ ac tertiæ. Hoc re­
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                  petebam ſæpius, ut loca illa quam potui accuratiſſime invenirem.
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                  Tum pyxidem plumbo & gravioribus, quæ ad manus erant, me­
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                  tallis implebam. </s>
                  <s>Sed prius ponderabam pyxidem vacuam, una
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                  cum parte fili quæ circum pyxidem volvebatur ac dimidio par­
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                  tis reliquæ inter uncum & pyxidem pendulam tendebatur.
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                  (Nam filum tenſum dimidio ponderis ſui pendulum a perpendiculo
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                  digreſſum ſemper urget.) Huic ponderi addebam pondus Aeris
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                  quem pyxis capiebat. </s>
                  <s>Et pondus totum erat quaſi pars ſeptuage­
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                  ſima octava pyxidis metallorum plenæ. Tum quoniam pyxis me-</s>
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