DelMonte, Guidubaldo, Mechanicorvm Liber

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1245[Figure 245]
tres partes æquales in γd; erit vnàquæq; Z γ γd d Y perimetro cy
lindri αβæqualis, quæ etiam perimetro cylindri AB æquales erunt; &
per conſequens ipſis IM, & ML.
connectatur Xd. & quoniam
duæ HI IL duabus XZ Zd ſunt æquales, & angulus HIL re­
ctus æqualis eſt angulo XZd recto; erit triangulum HIL trian­
gulo XZd æquale; & angulus HLI angulo XdZ æqualis; &
Xd ipſi HL æqualis.
ſed quoniam angulus XdZ maior eſt angu
lo XYZ; erit angulus HLI angulo XYZ maior. ac propterea planum
HL magis horizonti inclinat, quàm XY.
quare idempondus à minore
potentia ſuper planum XY, quàm ſuper planum HL mouebitur; vt faci
lè elicitur ex eadem nona Pappi.
cùm autem helices OQRSTVP nihil
aliud ſint, quàm planum XY horizonti inclinatum in angulo XYZ cir
ca cylindrum αβcircumuolutum; & helices CDEFG nihil ſunt
aliud, quàm planum HL horizonti inclinatum in angulo HLI cir
ca cylindrum AB circumuolutum; facilius ergo pondus ſuper he­

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