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

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1aeream lanuginem, ſeu cruſtam continguam, & con­

nexam
LG, verùm lanci oppoſitæ B, adhæret ſphæ­
ra
aerea HK denſior, vt potè non excalefacta à ferro
feruente
; hinc fit vt ſumma lancis B vnà cum adnexa
cruſta
ambientis aeris HK grauior ſit ærea lamina A
vnà
cum rariori lanugine aeris adhærentis LG. Mirum
igitur
non eſt, quòd a maiori pondere libræ extremi­
tas
E deprimatur, & ei oppoſita D eleuetur.
Eodem

ferè
modo, vt dicebam priùs, aer cubiculi circą,
caminum
cùm ſit valdè denſus, comparatus cum flam
ma
, & aere calefacto intra caminum exiſtente, &
ideò
valdè rarefacto, mirum non eſt ſi proptèr illius
grauitatem
excedentem ſursùm exprimat leuiorem
flammam
, acremque adhærentem paritèr rarum.
Eſt
igitur
euidentiſſimum in hiſce experimentis, quòd
aer
flammam ambiens, nedùm eam exprimit, ſed bonam
partem
aeris rarefactam vnà cum flamma impellit quo­
que
ſursùm.
Sed dicet aliquis, cur circa flammam̨

lucernæ
non obſeruatur prædictus ventus?
reſpon­
detur
non eſſe æquè ſenſibilem, quia nimirum lucer­
flamma non inſinuatur intra fiſtulam aliquam, vt
eſt
canalis camini, qui exitum habet extra cubiculum;
cùm
ergo lucernæ flamma vndique ambiatur ab aere
aperto
abſque euidenti cun motione eam impellere
ſursùm
poteſt exprimendo, nimirùm facto breui cir­
cuitu
à vertice flammæ vſque ad eius baſim, & ob
flammę
exiguitatem parua quoque eſt moles aeris ei
contigua
, quę agitatur, & conuoluitur, & hæc eſt
ratio
, quare circa lucernæ flammam ventus non ob-

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