Heron <Alexandrinus>
,
Heronis Alexandrini spiritalium liber
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THEOR EMATA SPIRITALIA.
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tamen inconveniens deſcribere modum fabricandi hanc pulcherrimam
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ſtructuram: </
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<
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">interea mihi reſervo alios complures modoselevandiaquam
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in aliam occaſionem, quando Deus mihi otium conceſſerit, ut poſſim
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abſolvere pulchras regulas generales Architecturæ quas jampridem deſcri-
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bereincepi. </
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<
s
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echoid-s2303
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xml:space
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">Fiat itaque rota, cujus diameter ſit ad minimum quinque vel
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ſex pedum, leviſſima, quantum fieri poteſt ex optimo ligno querno, ut ſub
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aqua durare poſſit: </
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>
<
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xml:space
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">craſſities ejus ſit ad minimum ſeſquipedis, & </
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<
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">apſis ſive
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extrema linea majoris diametri centrum verſus excavetur uſque in fundum
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unius pedis, poſtea dividatur linea extrema circumferentiæ rotæ in quinde-
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cim ad minimum diaphragmata & </
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<
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">diſcernicula ſint torta inſtar dimidiæ C,
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ita C, & </
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<
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xml:space
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">prout clare demonſtrat figura A B, cujus diaphragmata ſunt C, D,
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E, F, poſtea decuſſatis radiis ex optimo ligno querno, (quod ſatis dura-
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bile eſt in aqua) diametri bene committantur in centro & </
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<
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rotæ: </
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<
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">vel fiat rota cum ſcytalis, ut G, H: </
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xml:space
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">quædam ſcytalarum ſint I,
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K, L, M, quæidem præſtant, neque alia eſt differentia, niſi quod in ro-
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ta A B aqua deſuper cadit ſuper apſidem ſuperiorem: </
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<
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xml:space
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">& </
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<
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xml:space
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">G H circumvol-
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vitur per aquam ſubter ea fluentem: </
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<
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xml:space
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">poſſumus autem facere ut circum-
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volvatur quoque ut altera, ſed iſta circumvolvitur aqua fluente trans cen-
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trum, & </
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<
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">hæc fluxu aquæ in tantum cis centrum, differentia hæc eſt,
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quod rota cum ſcytalis circumvolvi poteſt minore fluxu aquæ: </
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<
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iſtæ ſcytalæ factæ fuerint ſatis amplæ, rota pauciſſimo fluxu circumvol-
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vetur, & </
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<
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">pauciſſima aqua, quemadmodum obſervare licet toto die in
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noſtris molis Paduanis. </
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">Hocfacto ſiat ut centrum ſit ex ferro toties & </
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tantum plicato, prout apparet, & </
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">quantum videbitur ſecundum quan-
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titatem aquæ, quam voluerimus elevare, vel ſecundumimpetum fluxus
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aquæ, quæ circumvolvet rotam: </
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<
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">eorum exemplar apparet in N, O;
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</
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<
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">Hoc infixum centro vicem præſtabit cardinum, ad
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circumvolvendum ibi ſurſum rotam ſuper duobus lignis, vel lapidibus,
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vel parietibus; </
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<
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xml:space
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">ut bene circumvolvat, dummodo ſub iſtis cardinibus po-
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nantur eorum (ut diximus) tympana ex ære, quod multo minus abroditur
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à ferro, & </
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">multo minus ferrum abrodit, quamferrum abrodit ferrum,
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qui fere ſubito corroditur, & </
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">in medio plicarum, ut in R, S, T, V, X,
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applicentur annuli ærei, ne ferrum corrodant: </
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<
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xml:space
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">intra capita eorundem
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affigantur ferramenta cum foraminibus, quæ congruunt, ubi per unum-
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quemque annulum tranfeat plus quam unus cuneus ferreus, quibus cou-
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niantur, ut monſtrat exemplar A A, & </
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mum longitudine ſua adæquare diametrum rotæ, & </
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lariter ponantur modioli ærei, cum aſſariis in fundo, prout in Machina
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Chtheſibiana dicunt Vitruvius, Vegetius, & </
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