Borelli, Giovanni Alfonso, De motionibus naturalibus a gravitate pendentibus, 1670

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1
cultates à pręclaro authore euulgatas, quę ab hac ex­
perientia deſumuntur; ſit fiſtula vitrea RSVX cuius
latitudo ſit duorum, vel trium digitorum, altitudo
verò ſit vnius, vel alterius cubiti, repleaturque aqua,

ſed remaneat in eius vertice portio aliqua aeris vni­
us, vel alterius digiti, poſtea foramine RX perfectè
occluſo, vel palma manus, vel operculo aliquo re­
uoluatur fiſtula vt eius infima baſis SV in ſupremolo­
co emineat, videbimus aerem è fundo RX ſursùm̨
aſcendere, atque incuruari ad modum arcus, ex par­
te ſuperiori ABC, & è contrà ex parte infima AGC,
aut explanari, vel etiam cauitatem aliquam ad mo­
dum ſcutellæ acquirere.
Hinc prædictus Author in­
fert certè deduci aerem ſursùm in præ­
54[Figure 54]
dicta fiſtula aſcendere propria virtutę
intrinſeca leuitatis non per extruſionem
factam ab aqua ambiente; quia, inquit
ipſe, aer ſupernè fastigiatur ad modum di­
ſculi, vt faciliùs peruadat aquam, & quaſi
perforet illam, quia aer est, qui turgeſcendo
ſursùm aquam introit, & cedere ſibi cogit
quaſi cuneo in illius medio adacto, alio quin
ſi idcircò aer ſursùm tendit quia ab aqua de­
orsùm tendente extruditur in ſuperiora, aqua
potiùs peruaderet cuneatim aerem; vt con­
tingit in pluuia, vel ſaltem retunderet ſuper­
nè illius tumorem, & infernè illum quaſi forcipe comprimens
constringeret ad figuram conoidem eius partem infimam.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
Alia argu­
menta pro
leuitate po­
ſitiua desump
ta à pulcher
rimo expe­
rimento.
Pro reſolutione harum difficultatum priùs metho-

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