Vitruvius, Vitrvvivs Itervm Et Frontinvs À Iocvndo Revisi Repvrgatiqve Qvantvm Ex Collatione Licvit, 1513

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          <pb o="138" file="0287" n="287" rhead="OCTAVVS."/>
          <p style="it">
            <s xml:space="preserve">N Vnc de ꝑductionibus ad habit ationes mœ
              <lb/>
            niaq́, ut fieri oporteat explicabo, cuius
              <lb/>
            rõ eſt prima perlibratio, Libratur autem
              <lb/>
            dioptris, aut libris aquariis, aut chorobate, ſed dili
              <lb/>
            gẽtius efficitur per chorobatẽ, ꝙ dioptrœ librœq́ fal-
              <lb/>
            lunt, Chorobates aũt eſt regula lõga cir citer pedũ. </s>
            <s xml:space="preserve">xx.
              <lb/>
            </s>
            <s xml:space="preserve">eahabet ancones in capitibus extremis æq̃limõ ꝑfe-
              <lb/>
            ctos, inq̃́ regulœ capitibus ad normã coagmẽtatos, & </s>
            <s xml:space="preserve">
              <lb/>
            inter regulã & </s>
            <s xml:space="preserve">ancones à cardinibus cõpacta trãſuer
              <lb/>
            ſaria, quœ habẽt lineas ad perpẽdiculũ recte deſcri
              <lb/>
            ptas, pẽdẽtiaq́ ex regula ꝑpẽdicu la in ſingulis ꝑtibus
              <lb/>
            ſingula, quœ cũregula fuerit collocata eaq́ tãgẽt œq̃,
              <lb/>
            ac pariter line as deſcriptiõis, idicabũt libratã colloca
              <lb/>
            tionẽ. </s>
            <s xml:space="preserve">Sin aũt uentus interpellauerit, & </s>
            <s xml:space="preserve">motiõibus li
              <lb/>
            neœ non potuerint certam ſignificationem facere, tũc
              <lb/>
            habeat in ſuperiore parte canalem longum pedes ꝗn
              <lb/>
            q́ latum digitum, altum ſeſquidigitum, eoq́ aqua in
              <lb/>
            fundatur, & </s>
            <s xml:space="preserve">ſiæqualiter aqua, canalis ſumma labra
              <lb/>
            tanget, ſcietur eſſe libr atum, Ita eo chorobate cũ per
              <lb/>
            libratum ita fuerit, ſcietur quantum habuerit faſti-
              <lb/>
            gii, Fortaſſe qui Archimedis libros legit, dia tnõ poſ
              <lb/>
            ſe fieriueram ex aqua libratiōem, ꝙ ei placet aquã
              <lb/>
            non eſſe libratam, ſed ſpheroides habere ſchema, & </s>
            <s xml:space="preserve">
              <lb/>
            ibi habere centrum, quo loci habet orbis terrarũ, Hoc
              <lb/>
            autem (ſiue plana eſt aqua, ſeu ſpheroides) nece ſſe
              <lb/>
            eſt, extrema capita canalis regulœ pariter ſuſtinere
              <lb/>
            aquam. </s>
            <s xml:space="preserve">Sin autem proclinatus erit ex una ꝑte, quœ
              <lb/>
            erit altior nõ hebit regulæ canalis in ſummis labris
              <lb/>
            aquam, Nece ſſe enim eſt quocunq́ aqua ſit infuſa, in
              <lb/>
            medio inflationem curuatur amq́ habere, ſed, </s>
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