Casati, Paolo, Terra machinis mota : dissertationes geometricae, mechanicae physicae hydrostaticae

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1dis Rom. antiqui, grauitas eſt exactè lib. 304
& ſphæræ ſunt in triplicatâ Ratione diame­
trorum, ſphæra ſtannea ſemidiametrum ha­
bens pedalem, ac proinde diametrum bipe­
dalem, eſt octuplo grauior illâ, atque adeò
lib, 2432. Atqui ſtannum ad argillam, eſt
vt 592 2d 135, igitur & eandem Rationem
habent æquales ſphæræ; ideoque ſi ſtannea
ſphæra ſemidiametrum pedalem habens nu­
merat in grauitate libras 2432, argillaceą
æqualis erit lib. (554 22/37). Hæc autem ad terræ
globum eſt vt vnitas ad quartum illum ter­
minum continuè proportionalem in Ratione
ſemidiametrorum. Multiplicetur igitur quar­

tus ille terminus 8791.700747.414127.
031000. per libras (554 22/37), & prodibit totius
terræ grauitas, ſi ex merâ argillâ conſtaret,
librarum 4.875829.711809.132072.
(327567 21/37).
XXV
Terreni glo
bi grauitas.
Gal. Immenſum places, Merſenne: lu­
culentiſsimè enim demonſtraſti quatuor illis
aut ſex ſupra centum orbiculis, de quibus
heri nobis ſermo erat, tellurem totam facil­
limè moueri poſſe, etiam ſi eius grauitati
quingenties millies millena librarum mil­
lia adiiceres.
Guld. Ita planè, ſi mera eſſet argilla: ſed
tot marmora ac lapides, ingentesque metal­

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