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

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1
Cap. 9. de
corpuſculo­
rum innatan­
tium
mutuo
amplexu at­
que fuga.
IN vaſe KVZG aqua pleno innatet lamina æneą
æquè craſſa ABCD, quæ efficiat in aqua foueam̨
KBCG, cuius altitudo SC & RB. dico SC ad DC mi­
norem proportionem habere quam grauitas in ſpecie
ipſius laminæ AC habet ad aquæ grauitatem.
quia x
hydroſtaticis moles aquæ æqua
146[Figure 146]
lis ſpatio GKBC æquè ponde­
rat, ac lamina AC vnà cum ae­
re GKAD (qui ob inſenſibilem
eius grauitatem negligi poteſt)
& pondus abſolutum laminæ AC ad abſolutam gra­
uitatem aquæ eiuſdem molis AC eamdem proportio­
nem habet quam grauitas ſpecifica laminæ AC ad
ſpecificam grauitatem aquæ, ergo grauitas laminæ ad
aquæ grauitatem in ſpecie eamdem proportionem̨
habet, quam pondus molis aquæ GKBC abſolutæ ad
pondus molis aquæ AC, ſeù proportionem, quam ha­
bet moles GKBC ad molem AC: eſt verò priſma RB
CS minus ſolido inæqualium baſium GKBC, ergo
priſma RBCS ad AC ſeù altitudo SC ad DC minorem
proportionem habet, quàm laminæ AC grauitas in­
ſpecie ad aquæ grauitatem.
Itaque vulgata propoſi­
tio vera eſſet ſi ſpatium cauitatis ab aere repletum
haberet parietes AK, & DG directos, & perpen­
diculares ad horizontem, ſcilicèt ſi baſis KG æqua­
lis foret ipſi AD; at quia ob curuitatem inſignem ſu­
perficierum AK & DG, ſemper altitudo CS ad craſſi­
tiem laminæ DC minorem proportionem habet quam
grauitas ſpecifica ſolidi AC ad eam, quam habet aqua.

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