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

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1
Cap. 4. poſi­
tiuam leui­
tatem noņ
dari.
PROP. XLII.
Et primò oſtendemus, quòd quodlibet corpus à principio in­
trinſeco, & naturali ſponte translatum faciliùs, &
celeriùs mouebitur in fluido rariori, & tenuio­
ri, quàm in medio fluido craſſo, &
tenaciori.
SInt duo vaſa GHIK, alterum KILM, primum aqua
repleatur, ſecundum verò hydrargyro, immer­
gatur verò eadem pila lignea A in vtroque fluido, in­
telliganturque duæ moles ſpatiales ex prædictis flui­
dis B, & C, quæ æquales ſint ipſi A, eique ſuperincun­
bant
, patet ergò quòd mercurij moles C grauior re­
ſiſtentior, denſior, atque compactior eſt, quàm ſit
40[Figure 40]
moles aquę B. præterea pila lignea
A nullo pacto aſcendere ſursùm po­
teſt, niſi aquam B, ab eius loco ex­
pellat vt ei locum cedat, atque mo­
les ipſius ligni A transferatur ad oc­
cupandum ſpatium ei æquale B, &
hoc ſemper contingit, vbique enim
in aſcenſu cogitur continuato niſu
ſursùm impellere incumbentem a­
quæ molem ei æqualem, tenacita­
temque eius penetrare, ponatur iam gradus natura­
lis impetus leuitatis ipſius ligni eſſe D, quia verò cor­
pus motiuum A impetu D affectum impellit corpus
B fluidum, quod in quiete conſtitutum ſua naturali

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