Newton, Isaac, Philosophia naturalis principia mathematica, 1713
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                  tallorum plena, pondere ſuo tendendo filum, augebat longitudi­
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                  nem penduli, contrahebam filum ut penduli jam oſcillantis eadem
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                  eſſet longitudo ac prius. </s>
                  <s>Dein pendulo ad locum primo notatum
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                  retracto ac dimiſſo, numerabam oſcillationes quaſi ſeptuaginta &
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                  ſeptem, donec pyxis ad locum ſecundo notatum rediret, totidem­
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                  que ſubinde donec pyxis ad locum tertio notatum rediret, atque
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                  rurſus totidem donec pyxis reditu ſuo attingeret locum quartum.
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                  Unde concludo quod reſiſtentia tota pyxidis plenæ non majorem
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                  habebat proportionem ad reſiſtentiam pyxidis vacuæ quam 78 ad
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                  77. Nam ſi æquales eſſent ambarum reſiſtentiæ, pyxis plena ob
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                  vim ſuam inſitam ſeptuagies & octies majorem vi inſita pyxidis
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                  vacuæ, motum ſuum oſcillatorium tanto diutius conſervare debe­
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                  ret, atque adeo completis ſemper oſcillationibus 78 ad loca illa
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                  notata redire. </s>
                  <s>Rediit autem ad eadem completis oſcillationibus 77.
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                  LIBER
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                  SECUNDUS.</s>
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                  <s>Deſignet igitur A reſiſtentiam pyxidis in ipſius ſuperficie exter­
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                  na, & B reſiſtentiam pyxidis vacuæ in partibus internis; & ſi reſi­
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                  ſtentiæ corporum æquivelocium in partibus internis ſint ut mate­
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                  ria, ſeu numerus particularum quibus reſiſtitur: erit 78 B reſiſten­
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                  tia pyxidis plenæ in ipſius partibus internis: adeoque pyxidis va­
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                  cuæ reſiſtentia tota A+B erit ad pyxidis plenæ reſiſtentiam to­
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                  tam A+78 B ut 77 ad 78, & diviſim A+B ad 77 B, ut 77 ad 1,
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                  indeque A+B ad B ut 77X77 ad 1, & diviſim A ad B ut 5928
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                  ad 1. Eſt igitur reſiſtentia pyxidis vacuæ in partibus internis
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                  quinquies millies minor quam ejuſdem reſiſtentia in externa ſuper­
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                  ficie, & amplius. </s>
                  <s>Sic vero diſputamus ex Hypotheſi quod ma­
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                  jor illa reſiſtentia pyxidis plenæ, non ab alia aliqua cauſa latente
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                  oriatur, ſed ab actione ſola Fluidi alicujus ſubtilis in metallum
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                  incluſum.
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                  <s>Hoc experimentum recitavi memoriter. </s>
                  <s>Nam charta, in qua il­
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                  lud aliquando deſcripſeram, intercidit. </s>
                  <s>Unde fractas quaſdam nu­
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                  merorum partes, quæ memoria exciderunt, omittere compulſus
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                  ſum. </s>
                  <s>Nam omnia denuo tentare non vacat. </s>
                  <s>Prima vice, cum un­
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                  co infirmo uſus eſſem, pyxis plena citius retardabatur. </s>
                  <s>Cauſam
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                  quærendo, reperi quod uncus infirmus cedebat ponderi pyxidis, &
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                  ejus oſcillationibus obſeQ.E.D. in partes omnes flectebatur. </s>
                  <s>Para­
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                  bam igitur uncum firmum, ut punctum ſuſpenſionis immotum ma­
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                  neret, & tunc omnia ita evenerunt uti ſupra deſcripſimus. </s>
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