Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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arcus preſſionis, reſpectu alicujus loci, qui prædictorum arcuum quaſi Po
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lus eſt; ex hoc capite maximus æſtus fit ad Indi Oſtia, ad Guineam, ad
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Oſtia fluminis Amazonum, ad oram Peruviæ. </
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<
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">Secundum caput eſt major
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aëris gravitas, quæ oritur ab humore admixto, vel aëre denſo, & compreſſo. </
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Auguſtin.
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<
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"> Tertium caput omittis, nempe quando Luna altior eſt, altior
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quoque eſt aëris gravitantis tractus, & linea dirimens à centro terræ lon
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giùs diſtat. </
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Antim.
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<
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id
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"> Hoc mihi reverà exciderat, quod exquiſita obſervatione con
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firmare poſſum; quando enim Luna in Apogæo exiſtit, tunc æſtus minor
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eſt: itaque vis preſſionis alia major eſt extenſivè, alia intenſivè; extenſivè
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à majore ſuperficie, cui arcus preſſionis incumbunt, idque cæteris pari
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bus; modò ſcilicet inæqualem preſſionem inducant; intenſivè autem à
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majore aëris gravitatione, quæ vel eſt à majore altitudine aëris, vel à ma
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jore humoris copia admixta; hinc major æſtus in Plenilunio, minor verò
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Luna Apogæa. </
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<
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">Secundò, Creſcit æſtus ex illapſu magis directo; ſic enim
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excurrit in illam oram, præſertim per fluminum alveos: nempe aſſurgit
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æſtus per majores vndas, doliorum inſtar, quarum vna aliam ſequitur; vn
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de fit, vt ſi obliquè incidat, non in oram, ſed in ipſum mare excurrat; ſi au
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tem in litus impingeret, altera ſuperveniente, aſſurgeret aqua, & plus ad
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huc tertiæ vndæ appulſu. </
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<
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id
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">Tertiò, Creſcit æſtus ratione ſinuum, nempe, vt
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jam dixi, ſi æſtus directè in ſinum paulò acutiorem & breviorem incidat,
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mirum quantum attollatur aqua, non tantùm propter anguſtias vaſis, ſed
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propter directum appulſum; ſic ad Briſtoliam, vt dixi, & ad fanum Sancti
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Michaëlis altiſſimus æſtus eſt, hic 70. illic 66. pedes; ad Oſtia fluminis Ama
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zonum, niſi per alveum fluvij excurſus pateret, altior forſitan eſſet: dixi ſu
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pra breviorem & acutiorem ſinum; vt enim expreſſione ſuperficiei aquæ
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quolibet vaſe contentæ per canaliculum altiùs aſcendit, quàm per majorem
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canalem; ita prorſus æſtus in breviore & Pyramidem deſinente ſinu;
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cùm enim minùs capax ſit, intruſa per vim preſſionis aqua altiùs aſcendat,
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neceſſe eſt. </
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<
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">Inter inſulas, vt plurimùm minùs aſſurgit aqua, tum quia vis
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preſſionis interrumpitur, tum quia cùm aqua per freta & anguſtias diſcur
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rat, ac proinde effluat, tam altè aſcendere non poteſt. </
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Auguſtin.
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<
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id
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"> Sed cur alicubi velociùs & rapidiùs, alibi ſenſim æſtus
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currit? </
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Antim.
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<
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"> Velocior motus, qui ab æſtu eſt, à multis cauſis procedit. </
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<
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">Primò
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à majore vi preſſionis; ſic majus pondus tubi erecti & aqua pleni, eam ve
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lociùs per foramen iuxta baſim apertum extrudit; major autem vis preſ
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ſionis eſt à majore ſuperficie ex arcubus vtilibus conſtante. </
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<
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id
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">Secundò, ab an
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guſtiis per quas aqua extrudenda eſt, vi preſſionis; ſicut dixi ſupra, in Fre
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tis, rapidus æſtus eſt, v.g. in anguſtiis ad Havanam, & alibi paſſim; ſic
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in fluminis alveo contracta aqua velociùs currit. </
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<
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">Tertiò à breviore angu
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ſtiarum alveo; ſic per breviorem fiſtulam foramini admotam, aqua velo
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ciùs extruditur </
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Auguſtin.
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<
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id
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"> Ne quid diſſimulem, hoc non capio, quanquam auguror ali
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quid ſcitu digniſſimum, ex hoc ipſo argumento affulgere. </
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