DelMonte, Guidubaldo, Mechanicorvm Liber

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1236[Figure 236]
Si verò (vt in tertia figura) ſupra cochleam imponatur aliquod,
vt B, quod quidem tylum vocant, ita accommodatum, vt inferio
ri parte helices habeat concauas ipſi cochleæ appoſitè admodum
congruentes; perſpicuum ſatis eſſe poterit, ipſum B, dum cochlea
circumuertitur, ſuper helices cochleæ eo prorſus modo moueri;
quo pondus iuxta primam figuram mouebatur: dummodo tylum ap­
tetur, vt docet Pappus in octauo libro; ita ſcilicet vt tantùm an­
tè, retrouè axi cylindri æquidiſtans moueatur. 237[Figure 237]
Et ſi loco tyli, quod helices habet concauas in parte inferiori, con
ſtituatur, vt in quarta figura, cylindrus concauus vt D, & in eius
concaua ſuperficie deſcribantur helices, incidanturq; ita, vt aptè

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