DelMonte, Guidubaldo
,
Mechanicorvm Liber
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<
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">ALITER. </
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<
s
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">Sit data cochlea AB duas habens helices æquales CDEFG; ſit
<
lb
/>
deinde alius cylindrus
<
foreign
lang
="
grc
">αβ</
foreign
>
ipſi AB æqualis, in quo ſummatur OP ip
<
lb
/>
ſi CG æqualis; diuidaturq; OP in tres partes æquales OR RT
<
lb
/>
TP, & tres deſcribantur helices OQRSTVP; erit vnaquæq; OR RT
<
lb
/>
TP minor CE, & EG: tertia enim pars minor eſt dimidia. </
s
>
<
s
id
="
id.2.1.241.2.1.2.0
">dico
<
lb
/>
idem pondus facilius ſuper helices OQRSTVP moueri, quàm ſu
<
lb
/>
per CDEFG. </
s
>
<
s
id
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id.2.1.241.2.1.2.0.a
">exponatur HIL triangulum orthogonium, ita vt
<
lb
/>
HI ſit ipſi CG æqualis, & IL duplo perimetri cylindri AB æqua
<
lb
/>
lis, & per
<
emph
type
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L
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emph.end
type
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italics
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I intelligatur planum horizonti æquiſtans; erit H
<
emph
type
="
italics
"/>
L
<
emph.end
type
="
italics
"/>
<
lb
/>
æqualis CDEFG; & H
<
emph
type
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italics
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L
<
emph.end
type
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italics
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I inclinationis angulus erit. </
s
>
<
s
id
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id.2.1.241.2.1.3.0
">exponatur
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ſimiliter
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emph
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X
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emph.end
type
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YZ triangulum orthogonium, ita vt XZ ipſi OP ſit æ
<
lb
/>
qualis, quæ etiam æqualis erit CG, & HI; ſitq; ZY cylindri pe
<
lb
/>
rimetro tripla, erit XY æqualis OQRSTVP. </
s
>
<
s
id
="
N1712F
">diuidatur ZY in </
s
>
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