Borelli, Giovanni Alfonso - De motionibus naturalibus a gravitate pendentibus

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

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ua reperit, quòd grauitas molis aeris, quæ æqualis
ſit cubo aqueo vnius libræ granum vnum pendet. at
Merſennus in Phęnomenis pneumaticis ope ignis ean-
dem experientiam fecit, ſumpſit æolo pilam æream,
eamque vehementiſſimo igne calefecit, vt prorsùs

candeſceret, & ſic in bilance perſectiſſima, quæ à ſe-
migraro ſlectebatur, examinauit pondus eiuſdem̨
ęolo pilæ candentis, eamque reperit vnciarum 4. drach.
6. & gran. 15. poſtea refrigerata æolo pila eius pon-
dus præcedentem ſuperauit gran. 4. & hinc elicit ae-
rem incluſum in æolo pila grana 4. ponderaſſe, porrò
pondus aeris illius ad æqualem aquæ molem ait re-
periſſe in proportione 1. ad 1356.

4. de cęlo.
cap. 4.

Cap. 5. de ae-
ris grauitate
æquilibrio,
ſtructura, &
vi elaterią
eius.

Prop. 29.

Sed prædicta experientia multis nominibus infi-
delis eſt, primò quia corpora vehementer excalefacta
in bilance ſuſpenſa non oſtendunt veram grauitatem

eorum, ſed diminutam, quia vt ſuperiùs oſtenſum̨
eſt, ignis diffuſus ab æolo pila candente valdè rare-
facit aerem prædictam æolo pilam ambientem, cum-
que aer ambiens fimul cum pila vnum corpus graue
componat intra denſiorem aerem ſuſpenſum, fit vt
aggregatum prædictum minùs graue ſpecie ſit, quam
prius, & proinde imminuitur grauitas æreæ æolo pi-
læ, non ſolùm ob deſectum aeris incluſi, ſed etiam ob
eius ſeruentiſſimam caliditatem.

c 4 prop. 61.

Rursùs aer in ęolopila à vehementiſſimo igne am-
pliatus expanſuſque non poteſt dici verè rarefactus,
quia nimirùm copia ignis vehementiſſimè agitati, &
circumuoluti intra æolo pilæ cauitatem diſgregat, ac

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