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

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1
viſu
, ſed tactu, poſſum enim abſque noxa manum ad
latus
flammæ approximare, vt ferè eam contingam,
non
verò poſſum manum ſupra flammæ verticem
notabili
diſtantia vnius palmi abſque dolore, &
ſtione
retinere, igitur dicendum eſt, quòd ſubſtan­
tia
illa ignita vltra verticem flammæ redditur tranſ­
parens
, & ideò inuiſibilis alia noua de cauſa efficitur.
Sed tamen negari non poteſt productio, & extenſio
ſubſtantiæ
igneæ vltra flammam productæ, cùm hoc
ab
ipſo tactu conuincatur.
Sed dices, quare ſupra flam­
verticem in multò maiori altitudine non ampliùs
tactu
percipitur effluuium calidiſſimum eius, vt pro­
eius verticem percipiebatur?
At forſan hoc acci­
dit
, quia ignea ſubſtantia fluidiſſima ab occurſu aeris
diſpergitur
, & ſubdiuiditur in alias partes minores
ab
inuicem diuiſas, & diſcretas, vt videmus aquæ
copiam
è ſumma turri delapſam in progreſſu deſcen­
ſus
ſubdiuidi in innumeras guttulas inter ſe diſcre­
tas
, & ſicuti non æquè humectat, & madefacit pluuia
illa
, ac maſſa integra aquæ vnita, quia nimirùm nul­
la
pars ſubiecti corporis à maſſa continua aquæ tacta
relinquitur
arida, cùm in pluuia non omnes partes ſo­
li
madefiant humectentur que, ita propè verticem flam
ignis vnitus manum percutit, atque terebrat, cum
è
contra in remotiori altitudine ſpicula illa ignea val­
diſcreta plagas exiguas, & inter ſe diſtantes
ipſa
manu inferant, & hinc minori noxa, minorique
dolore
incurſus ignis tolerari poterit.

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