DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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">PROPOSITIO II. </
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<
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">Libra horizonti æquidiſtans, cuius centrum
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ſit ſupra libram, æqualia in extremitatibus, æqua
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literq; à perpendiculo diſtantia habens pondera,
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ſi ab eiuſmodi moueatur ſitu, in eundem rurſus
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relicta, redibit; ibíq; manebit. </
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">Sit libra AB recta li
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nea horizonti æquidi
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ſtans, cuius centrum C
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ſit ſupra libram; ſitq; CD
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<
expan
abbr
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perpendiculũ
">perpendiculum</
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, quod ho
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rizonti perpendiculare
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erit: atq; diſtantia DA ſit
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diſtantiæ DB æqualis;
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ſintq; in AB pondera æ
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qualia,
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abbr
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quorũ
">quorum</
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grauitatis
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centra ſint in AB
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abbr
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pũctis
">punctis</
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. </
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Moueatur AB libra ab
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hoc ſitu, putá in EF, deinde relinquatur. </
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<
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">dico libram EF in AB ho
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rizonti æquidiſtantem redire, ibíq; manere. </
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<
s
id
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id.2.1.5.4.1.4.0
">Quoniam autem pun
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ctum C eſt immobile, dum libra mouetur, punctum D circuli cir
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lb
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cumferentiam deſcribet, cuius ſemidiameter erit CD. quare cen
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tro C, ſpatio verò CD, circulus deſcribatur DGH. </
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<
s
id
="
id.2.1.5.4.1.4.0.a
">Quoniam
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lb
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enim CD ipſi libræ ſemper eſt perpendicularis, dum libra erit in
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EF, linea CD erit in CG, ita vt CG ſit ipſi EF perpendicula
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ris. </
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<
s
id
="
id.2.1.5.4.1.5.0
">Cùm autem AB bifariam à puncto D diuidatur, & pondera
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in AB ſint æqualia; erit magnitudinis ex ipſis AB compoſitæ cen
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arrow.to.target
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="
note3
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trum grauitatis in medio, hoc eſt in D. &
<
expan
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quãdo
">quando</
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libra vná cum pon
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deribus erit in EF; erit magnitudinis ex vtriſq; EF compoſitæ cen
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trum grauitatis G. </
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<
s
id
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id.2.1.5.4.1.5.0.a
">& quoniam CG horizonti non eſt perpendi
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cularis;
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n
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note4
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magnitudo ex ponderibus EF compoſita in hoc ſitu mi
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nimè perſiſtet, ſed deorſum
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ſecũdùm
">ſecundùm</
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eius centrum grauitatis G per
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circumferentiam GD mouebitur; donec CG horizonti fiat per</
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