Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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vera elevatio licèt aliquem aquarum motum dicat, non tamen ita acci
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pienda eſt, vt aqua à circulo maximæ preſſionis ad punctum maximæ ele
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vationis excurrat, totumque illud ſpatium conficiat, ſed vt pars aquæ aliam
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partem pellat, & hæc aliam; cogita veſicam aqua plenam, quam vel ma
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nu, vel fune in ſpiras acto ſtringis, ac proinde temporis ferè momento tu
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mor attollitur, quod certè per motum obtineri non poſſet. </
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<
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id
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s.001448
">Tertiò, per
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motum aquam elevatam versùs litus excurrere, & averſis ire fluminibus,
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ad inſtar majoris cujuſdam dolij; vbi enim litore altior eſt, in litus exun
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dat; idem dico de ſuprema fluminum ſuperficie: & hæc eſt ratio cur
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aqua, per æſtum exundet, quia cum prædictæ preſſionis vi, etiam ver
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sùs oram & litus extollatur, in litus ipſum, quod inferius eſt, & in ſub
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jacentis fluminis alveum excurrit, ſublata verò preſſione, aqua illa,
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quæ priùs exundarat in litus, cum ſit altius ipſa maris, poſtquam detu
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muit, ſuperficie, versùs ipſum mare refluit. </
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<
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id
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">Quartò, Majorem arcum
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vtilem plùs, minorem verò minùs præſtare; præſertim cùm ſuo modo
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accedat ratio vectis, ſicuti brevior baculus difficiliùs curvatur, quàm
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longior; hinc major arcus minorem ſuperat, & major ſuperficies aquæ
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ex præſatis arcubus conſtans vincit minorem ex arcubus etiam conſtan
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tem; ſunt autem hujuſmodi arcus paralleli circulo maximæ preſſionis;
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& cum in ſingulis punctis circuli vtilis, æqualis preſſio cenſeatur, inæ
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qualitas preſſionis directæ accipienda eſt in arcubus ad angulos rectos
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ſecantibus prædictos preſſionum arcus. </
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<
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id
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">Quintò, Suppono ad aquam extru
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dendam, per anguſtiorem alveum, ſeu canalem, minorem preſſionis vim de
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ſiderari, vt conſtat ex doctrina motuum; nempe major mobilis, ſeu moven
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di corporis moles motui magis reſiſtit. </
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Auguſtin.
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<
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id
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"> Cuncta hæc ſatis intelligo; ſtatuo enim globum iſtum in
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ſitu Sphæræ rectæ; ita vt axis & poli ſint in plano horizontis; aſſum
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ptoque ſupremo globi puncto, ſeu vertice, illius horizon, qui per Po
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los deſcribitur, eſtque vnus ex Meridianis & diſtat à puncto aſſumpto
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90. grad. circulus maximæ preſſionis erit, cui ſi omnes parallelos acci
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piam, omnes circulos preſſionum habeo, & probè diſtinguo arcus
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vtiles ab inutilibus, & portionem ſuperficiei ab vtilibus rectam, ſeu
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occupatam, ab alia; quæ profectò quantum varia ſit, cùm hinc expli
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cetur, illinc contrahatur, inde versùs Ortum, hinc versùs Boream ex
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currat ſatis patet. </
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<
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id
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">Vt autem majoris, vel minoris vim definiam, ratio
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ne ſcilicet puncti aſſumpti, initio ducto ab horizonte, ſeu circulo ma
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ximæ preſſionis, conſidero ac metior ſuperficiem vtilem (ſic eam vo
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co, quam arcus vtiles occupant) pro cujus diverſo ſitu, & diver
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ſa extenſione, diverſa ſequitur preſſio & elevatio in puncto aſſum
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pto Æquatoris; Hoc ſat benè intelligo; vellem tantùm, vt illud quod
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vltimo loco adſtruxiſti, de aqua in anguſtias redacta paulò fuſiùs ex
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plicares. </
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Antim.
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<
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id
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"> Per me licet; ſupponamus ita extrudi per canalem ADH.
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vt altitudo alvei pleni ſit AC, latitudo verò initio ſit AB, ſed qui
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retenta eadem altitudine, contrahatur ſecundùm latitudinem, ac proin-</
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