DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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<
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">Si Pondus in eius centro grauitatis a recta ſu
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ſtineatur linea, nunquam manebit, niſi eadem li
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nea horizonti fuerit perpendicularis. </
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<
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">Sit pondus A, cuius centrum gra
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uitatis B, quod à linea CE ſuſti
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neatur. </
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">Dico pondus nunquam
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permanſurum, niſi CB horizonti
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perpendicularis exiſtat. </
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<
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ctum C immobile, quod vt pon
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dus ſuſtineatur, neceſſe eſt. </
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<
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">& cum
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punctum C ſit immobile, ſi pon
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dus A mouebitur, punctum B cir
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culi circumferentiam deſcribet,
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cuius ſemidiameter erit CB. qua
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re centro C, ſpatio verò BC, cir
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culus deſcribatur BFDE. </
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<
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primum BC horizonti perpendicularís, quæ vſq; ad D produca
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tur; atq; punctum C ſit infra punctum B. </
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<
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">Quoniam enim pondus
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A ſecundum grauitatis centrum B deorſum mouetur; punctum
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B deorſum in centrum mundi, quò naturaliter tendit, per re
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ctam lineam BD mouebitur: totum ergo pondus A eius cen
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tro grauitatis B ſuper rectam lineam BC graueſcet. </
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<
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">cum au
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tem pondus à linea CB ſuſtineatur, linea CB totum ſuſti
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nebit pondus A; ſuper quam deorſum moueri non poteſt, cum
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ab ipſa prohibeatur: per definitionem igitur centri grauitatis pun
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ctum B, ponduſq; A in hoc ſitu manebunt. </
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<
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">& quamquam B quo
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cunq; alio puncto circuli ſit ſublimius, ab hoc tamen ſitu deorſum
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per circuli circumferentiam nequaquam mouebitur non enim ver
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ſus F magis, quàm verſus E inclinabitur, cum ex vtraq; parte æqua
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lis ſit deſcenſus; neq; pondus A in vnam magis, quàm in alteram
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partem propenſionem habeat: quod non accidit in quouis alio
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puncto circumferentiæ circuli (præter D) ſit ponderis eiuſdem </
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