DelMonte, Guidubaldo, Mechanicorvm Liber

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22
Nam ſi libra AB habeat
centrum C ſupra libram;
ſitq; trutina CD infra li­
bram; moueaturq; libra in
EF; tunc EF rurſus in AB
horizonti æquidiſtantem
redibit.
ſimiliter ſi libra
centrum C habeat infra li
bram, ſitq; trutina CD ſu
pra libram, & moueatur
libra in EF; patet libram
ex parte F deorſum moue
ri, trutina ſupra libram e­
xiſtente.
& in quocunq; a­
lio ſitu fuerit trutina, idem
ſemper eueniet.
non igitur
trutina, ſed centrum libræ
harum diuerſitatum cau­
ſa erit. 41[Figure 41]
Animaduertendum eſt
itaq; in hac parte difficulter materialem libram conſtitui poſſe,
quæ in vno tantùm puncto ſuſtineatur; quemadmodum mente
concipimus.
brachiaq; ab eiuſmodi centro adeò æqualia habeat,
non ſolum in longitudine, verùm etiam in latitudine, & profun
ditate, vt omnes partes hinc indé ad vnguem æqueponderent.

hoc enim materia difficilimè patitur.
quocirca ſi centrum in ipſa
libra eſſe conſiderauerimus, ad ſenſum confugiendum non eſt:
cùm artificilia ad ſummum illud perfectionis gradum ab artifice
deduci minimè poſsint.
In aliis verò experientia quidem appa­
rentia docere poterit; propterea quod, quamquam centrum libræ
ſit ſemper punctum, quando tamen ſupra libram fuerit, parùm re­
fert, ſi libra in eo puncto adamuſſim minimè ſuſtineatur; quia cùm
ſit ſemper ſupra libram, idem ſemper eueniet.
ſimili quoq; modo
quando eſt infra libram: quod tamen non accidit centro in ipſa li­
bra exiſtente.
ſi enim ad vnguem ſemper in illo medio non ſu­
ſtineatur, diuerſitatem efficiet; cùm facillimum ſit, centrum il­

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