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

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1
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LXVIII.
Flamma rarior fumo minus ſpatium occupat ob maximam
eius velocitatem, redditurque poſtea inuiſibilis noua
de cauſa, & tactui languida ob eius
diſperſionem.
OBſeruatur profectò titionem fumi copiam ingen­
tem
euomere, ſed ſi denuò eius flamma reui­
uiſcat, hęc mirabili velocitate fumi illius vaſtam mo­
lem abſumere videtur, eumque in exiguum ſpatium
flammæ concludere, cùm reuera non ſit reſtrictio,
flamma enim maiorem raritatem habet, quàm fumus,
pendet ergo hoc ab ineffabili velocitate partium̨
flammæ.
aliundè enim notum eſt per reſtrictum flu­
minis canalem molem ampliſſimam aquæ totius flu­
minis pertranſire, non quia in exiguo, & reſtricto illo
ſpatio canalis condenſetur tota aqua fluuij, ſed quia
velociſſimo motu per eum excurrit; cùm è contrà in
parte ampla fluuij aqua lentiſſimo curſu progredia­
tur, ſic paritèr in fumo particulæ eius lento, & tardo
gradu excurrentes amplum, & grande ſpatium oc­
cupabant, in flamma verò eædem particulæ veluti per
ſtrictiſſimum canalem mirabili, & ineffabili veloci­
tate currunt, & ſic poſſunt exiguum ſpatium comple­
re.
Sed quare flamma vltra verticem eius non exten­
ditur, neque viſibilis redditur?
hìc primò dicendum,
quòd reuerà flamma producitur vltra eius verticem
per notabile ſpatium, & hoc quidem percipitur non

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