Vitruvius
,
De architectura libri decem
,
1567
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gradationes circum habebant, & </
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latius quàm graduum retractiones per quod iter erat ad gradus. </
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<
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">Tres erant præcinctiones, prima imæ, ſecun-
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da mediæ, tertia ſuperiori regioni dabatur: </
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<
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">ſed eaſcala, quæ ad primam præcinctionem ducebat, non dirige-
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batur ad ſecundam præcinctionem, ſed in media ſecunda præcinctione alia erat ſcala, quæ ad tertiam dirigebat,
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atque ita ſcalæ non erant directæ, nec continui aſcenſus. </
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<
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rum trigonorum ſcalarum apertiones dirigi, quæ quaſi cuneum formant, nam duæ lineæ, quæ a circumferentia
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unà diſcedunt, & </
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acumine proueniens, quod est in circinatione ad centrum, & </
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qui diriguntur ad primam præcinctionem ibi terminari, & </
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angulis interpoſitis obuiam eant, & </
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ſecundam direxere, ſed alijs medijs alternantibus apertionibus, & </
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ad centrum directæ æque diſtantes. </
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altera a ſiniſtris diametri, & </
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<
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<
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