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

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diuelluntur, ſed etiam corpora illa, quæ continuą
cenſentur, vt eſt columna marmorea, vel virga me­
tallica, tandèm à vi trahente diſtrahitur, euelliturque
directo motu vna pars ab altera, quæ tenaciori glu­
tine vinculoque vniuntur, quàm illa duo corpora ſe
mutuò tangentia, & ſimplici contactu vnita.
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. LXXXIX.
Verùm prædictam vim, quæ requiritur ad ſeparanda duo cor­
pora ſe mutuò tangentia, posſibile eſt mediante libra
menſurari hac ratione.
SIt cylindrus CAB cuius baſis
69[Figure 69]
AB perfectiſſimè explanata,
& lęuigata congruat exoſcule­
turque ſuperficiem pauimenti DE,
pari diligentia complanatam, &
lęuigatam, & cautionis gratią,
vttuti omninò ſimus aerem am
bientem penetrare, ac ingredi non poſſe inter præ­
dictas duas complanatas ſuperficies poſſent colliga­
ri tùm cylindro, tùm pauimento duæ laminæ vitreæ
AB, & DE, aut alterius ſubſtantiæ duriſſimæ, quæ in­
ſtar ſpeculi explanatæ, & lęuigatæ ſint; poſteà com­
primantur, vna, ſuper alteram intrà aliquod fluidum
viſibile veluti eſt aqua, vel hydrargyrum, vt nimi­
rùm viſu conſtet nihil omninò intercipi inter prædi­
ctas duas ſuperficies, dum nimirùm vna earum trahi­
tur, vt ab altera diuellatur.
Colligetur poſtea cylin-

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