Fabri, Honoré
,
Dialogi physici in quibus de motu terrae disputatur
,
1665
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ſit attolli; modò per quaſlibet anguſtias immitti & traduci queat; qua
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enim proportione decreſcit baſis, creſcit, altitudo; ſed quæſo te, quid fiet,
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ſi aquæ ſuperficies non ſit in AB, ſed in HK. </
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Antim.
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<
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"> Certum eſt, minorem inde fore aquæ elevationem; quia preſ
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ſio in baſim HK minor eſt quam in baſim AB; quia fit ſub minore an
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gulo, v.g. ſtante baſi in AB, aſſurgeta qua in DE ſupra libellam FG, de
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preſſa verò baſi in HK ſupra libellam HP, aſſurget aqua in R, eritque
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PR minor quàm GE. </
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<
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">Hîc autem obſervo aliud experimentum, reverà
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pulcherrimum, nempe ſuperficies aquæ in HK, non eſt plana, nedum
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convexa, ſed omnino concava; cùm tamen AB modo humor extet, ſit
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convexa. </
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Auguſtin.
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"> Hoc etiam ſæpiùs obſervavi, & cauſam hujuſce peregrini
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effectus curiosè perſcrutatus ſum; nec crediderim ab vllo vſpiam prodi
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tam fuiſſe. </
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Antim.
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<
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"> Ex præmiſſis facilè deducitur, modò tantulum Geometriæ ac
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cedat. </
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">Suppono enim AB quaſi baſim trianguli, cujus vertex terminetur
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ad HK, cujus trianguli angulus verticis major eſt, qui cadit in centrum
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D prædictæ baſis, quàm is, qui cadit in extremitates baſis H vel K ; vt pa
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tet ex Geometria; igitur major vis preſſionis incumbit in centrum O,
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quàm in H vel K, & conſequenter in ea puncta major, quæ accedunt
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propiùs ad centrum O; quid mirum igitur, ſi punctum O ſubſidat, &
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tota ſuperficies HOK cava ſit, propter inæqualem illam preſſionis vim. </
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Chryſoc.
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<
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"> Sed quæſo te, Antime, cur aquæ ſuperficies AB convexa eſt?
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">video enim, cur cava non ſit, cùm inæqualis illa preſſio deſideretur; cur
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tamen convexa ſit, non plana, haud ſatis video. </
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Antim.
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<
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"> Res ſatis trita eſt; nempe illa humoris ſuperficies à centro
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mundi æqualiter diſtat ſecundùm omnes partes; ſi enim aliqua longiùs
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à præfato centro diſtaret, quàm aliæ, deſcenderet illico; hæc certè vt ve
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ritati conſona, negari ab vllo non poſſunt; ſed profectò hæc convexitas
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inſenſibilis eſt, nempe arcus vnius minuti continet 1000. paſſus geome
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tricos, vnius ſecundi arcus 16. paſſus &
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id eſt 83. pedes circiter arcus
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vnius tertij vnum pedem tubos vix habemus majoris diametri; quis
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porrò arcum vnius tertij minuti à linea recta ſenſu diſtinguat? </
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<
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">Cùm igi
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tur convexam ſuperficiem aquæ probè diſcernamus, aliam omnino eſſe
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neceſſe eſt (& hoc ſit aliud experimentum) nempe vbi humor extremita
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tes A & B baſis attigit, non effluit aqua, ſed intumeſcit in centro ſuper
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ficiei; centro enim minor vis preſſionis incumbit, quàm partibus extre
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mis, v.g. in centrum V vis preſſionis incumbens infra horizontalem AB
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non cadit, cum tamen incumbens in A & in B infra prædictam horizon
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talem deſcendat, vt patet, quò fit, ne aqua ex A vel B effluat & hæc vera
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eſt & legitima triti hujus experimenti ratio. </
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Chryſocomus.
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<
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"> Non bene capio quid tibi velis; nonnihil, quæſo te,
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ſchematis adhibe, tunc enim oculis potiùs quàm auribus fidem ha
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bebo. </
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Antim.
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<
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"> Sit vas quodpiam aqua plenum AEDB, ſit aquæ ſuprema </
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