DelMonte, Guidubaldo
,
Mechanicorvm Liber
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lices OQRSTVP mouebitur, quàm ſuper helices CDEFG. </
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Ex
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2
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huius.
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21
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Primi.
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<
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">Si autem OP diuidatur in quatuor partes æquales, deſcribantur
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què circa
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quatuor helices; adhuc facilius pondus mouebitur ſu
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per has quatuor, quàm ſuper tres OQRSTVP. </
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<
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N171DB
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erunt helices, eò facilius pondus mouebitur. </
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<
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">quod demonſtrare
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oportebat. </
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">Tempus verò huius motus facilè patet, helices enim CDEFG
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ſunt æquales HL; helices verò OQRSTVP ſunt æquales
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XY: ſed XY maior eſt HL; ideo fiat Y
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ipſi HL æqualis: ſi igi
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tur duo pondera ſuper lineas LHY
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X
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moueantur, & veloci
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tates motuum ſint æquales, citius pertranſibit quod mouetur ſuper
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LH, quàm quod ſuper Y
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X
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mouetur. </
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<
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">in eodem enim tempore erunt
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in H
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. </
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<
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">quare tempus eius, quod mouetur ſuper helices OQRS
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TVP, maius erit eo, quod eſt menſura eius, quod mouetur ſuper C
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DEFG. </
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">& quò plures erunt helices, eò maius erit tempus. </
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<
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">cùm au
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tem datæ ſint lineæ HI
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XZ
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, & IL
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Z
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Y: datæ enim ſunt cochleæ AB
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<
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; & anguli ad IZ recti dati; erit HL data. </
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<
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">ſimiliter &
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X
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Y data
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erit. </
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">quare & harum proportio data erit. </
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">temporum igitur propor
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tio eorum, quæ ſuper helices mouentur data erit. </
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Ex
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18
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Primi.
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Ex
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48
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primi.
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1
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Datorum & Ex ſexta primi Ioannis de Monte rego de triangulis.
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<
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">Alterum, quod efficit, vt pondera facilè mo
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ueantur, ſunt ſcytalæ, aut manubria, quibus co
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chlea circumuertitur. </
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