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

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1cantherius, qui nequear ſolus trochlearum
multiplicium ope, maius tormentum belli­
cum trahere?
XII
Vnicus e­
quus facilè
poteſt mo­
uere ingens
pondus, quod
vix poſſent
plures equi.
Gal. Ita planè: ſed obſeruandum in fu­
nibus.
XIII
Quantum
funium in
hac machi­
natione re­
quiratur.
Merſ. Ne plura: ſatis animum ad hoc
aduerti.
Monere volebas tantam requiri
longitudinem funis, qui ſecundas trochleas
D & C circumplectitur, vt vnicus ex D in
C ductus æqualis ſit longitudini ſpatij, quod
potentia in F totum explicans funem, & pon­
dus P ad trochleam A vſque deducens, per­
curreret.
Quarè ſi interuallum trochlearum
AB ſit paſſuum decem, potentia ex F per­
curreret paſſus 50: funis itaque trochleas D
& C ambiens longitudinem habeat neceſſę
eſt paſſuum vt minimum 200; trochleą
enim D ibi firmanda eſt, quò funis ABF
explicatus pertingere poſſit.
Eademque dę
cæteris, ſi plures fuerint trochleæ, ratio eſto.
Gal. Non falsâ coniecturâ animum meum
proſpexiſti.
Sed vt ad rem ipſam propiùs
accedamus obſeruandum eſt, propoſito quo­
cunque orbiculorum numero, qui tameņ
per 2, vel 4, vel 6, vel alium quemcunque
numerum parem diuidi poſsit, longè maius
eſſe potentiæ momentum, ſi plures trochleæ
pauciorum orbiculorum, quàm ſi pauciores

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