Varro, Michael
,
De motv tractatvs
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cylindri longitudo: illa verò qua mouere volumus,
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in orbem moueatur, aut ſi eius nutus linea recta ſit,
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circa cylindrum fluens illum moueat contingendo. </
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>Et hæc quidem de mediis in ſuo genere
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conſiſtẽ-tibus
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tibus</
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>Poſſunt autem fieri eorum Syzygiæ vectis ſci
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licet cum trochleis, helicis cum vecte, aut cum tro
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chleis, aut
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omniũ
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ſimul. </
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>Vectis cum trochleis ſi fu
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nis illud extremum, quod mouetur in trochleis, er
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gatis aut ſuculis inuoluatur: helix cum vecte
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coniũ-getur
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getur</
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, ſi tympanus circum axem moueatur, ſitque i
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ta denticulatus, vt dentes ipſius helicem in cylindro
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excauatam ingrediantur, quam machinam helicem
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perpetuam vulgò vocant, eò quòd eius conuerſio
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perpetua eſſe poſſit, cum helicis ſimplicis operatio
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non excedat ipſius longitudinem. </
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<
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omniũ
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tum inter ſe, tum ad ſubiecta mouenda accommo
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datio adeò varia eſt, vt ſcripto
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cõprehẽdi
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vix poſſit.
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>Ex his autem quæ dicta ſunt, mediocris ingenij me
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chanicus poterit ea prout ipſi neceſſe erit aptare. </
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<
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machinis autem omnibus hæc cautio
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adhibẽda
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eſt,
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vt earum ſtructura firma ſit, præſertim verò vbi cir
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cum axes aliquas fit motus, deinde vt vincula, qui
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bus illis vires
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affingũtur
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, valida ſint, illarum enim o
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mnium vis in ſuo ſtatu manendi vtrique vi aptandæ
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æqualis eſſe debet: aget enim in illas vis
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vtraq;
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, quòd
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ſi medium firmum non ſit, motus in ipſa machina </
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