Heron <Alexandrinus>, Heronis Alexandrini spiritalium liber

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              <pb o="115" file="0121" n="121" rhead="THEOR EMATA SPIRITALIA."/>
            tamen inconveniens deſcribere modum fabricandi hanc pulcherrimam
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            ſtructuram: </s>
            <s xml:id="echoid-s2302" xml:space="preserve">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. </s>
            <s xml:id="echoid-s2303" xml:space="preserve">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: </s>
            <s xml:id="echoid-s2304" xml:space="preserve">craſſities ejus ſit ad minimum ſeſquipedis, & </s>
            <s xml:id="echoid-s2305" xml:space="preserve">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 & </s>
            <s xml:id="echoid-s2306" xml:space="preserve">diſcernicula ſint torta inſtar dimidiæ C,
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            ita C, & </s>
            <s xml:id="echoid-s2307" xml:space="preserve">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 & </s>
            <s xml:id="echoid-s2308" xml:space="preserve">circumferentia
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            rotæ: </s>
            <s xml:id="echoid-s2309" xml:space="preserve">vel fiat rota cum ſcytalis, ut G, H: </s>
            <s xml:id="echoid-s2310" xml:space="preserve">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: </s>
            <s xml:id="echoid-s2311" xml:space="preserve">& </s>
            <s xml:id="echoid-s2312" xml:space="preserve">G H circumvol-
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            vitur per aquam ſubter ea fluentem: </s>
            <s xml:id="echoid-s2313" xml:space="preserve">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, & </s>
            <s xml:id="echoid-s2314" xml:space="preserve">hæc fluxu aquæ in tantum cis centrum, differentia hæc eſt,
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            quod rota cum ſcytalis circumvolvi poteſt minore fluxu aquæ: </s>
            <s xml:id="echoid-s2315" xml:space="preserve">nam@ſi
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            iſtæ ſcytalæ factæ fuerint ſatis amplæ, rota pauciſſimo fluxu circumvol-
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            vetur, & </s>
            <s xml:id="echoid-s2316" xml:space="preserve">pauciſſima aqua, quemadmodum obſervare licet toto die in
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            noſtris molis Paduanis. </s>
            <s xml:id="echoid-s2317" xml:space="preserve">Hocfacto ſiat ut centrum ſit ex ferro toties & </s>
            <s xml:id="echoid-s2318" xml:space="preserve">in
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            tantum plicato, prout apparet, & </s>
            <s xml:id="echoid-s2319" xml:space="preserve">quantum videbitur ſecundum quan-
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            titatem aquæ, quam voluerimus elevare, vel ſecundumimpetum fluxus
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            aquæ, quæ circumvolvet rotam: </s>
            <s xml:id="echoid-s2320" xml:space="preserve">eorum exemplar apparet in N, O;
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            </s>
            <s xml:id="echoid-s2321" xml:space="preserve">ſed melius in P, Q. </s>
            <s xml:id="echoid-s2322" xml:space="preserve">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; </s>
            <s xml:id="echoid-s2323" xml:space="preserve">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, & </s>
            <s xml:id="echoid-s2324" xml:space="preserve">multo minus ferrum abrodit, quamferrum abrodit ferrum,
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            qui fere ſubito corroditur, & </s>
            <s xml:id="echoid-s2325" xml:space="preserve">in medio plicarum, ut in R, S, T, V, X,
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            applicentur annuli ærei, ne ferrum corrodant: </s>
            <s xml:id="echoid-s2326" xml:space="preserve">& </s>
            <s xml:id="echoid-s2327" xml:space="preserve">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, & </s>
            <s xml:id="echoid-s2328" xml:space="preserve">hæc ferramenta debent ad mini-
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            mum longitudine ſua adæquare diametrum rotæ, & </s>
            <s xml:id="echoid-s2329" xml:space="preserve">ſubillis perpendicu-
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            lariter ponantur modioli ærei, cum aſſariis in fundo, prout in Machina
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            Chtheſibiana dicunt Vitruvius, Vegetius, & </s>
            <s xml:id="echoid-s2330" xml:space="preserve">Valturia, quæ ſunt </s>
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