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

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            unde flatus uentorum certiſpirent. </s>
            <s xml:space="preserve">Quod cum ita ex
              <lb/>
            plor atum habeatur, utinueniantur regiones & </s>
            <s xml:space="preserve">or-
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            t
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            us eorum, ſic eritratiocinandum. </s>
            <s xml:space="preserve">Collocetur adli-
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            bellam marmoreum amuſium mediis mœnibus, aue
              <lb/>
            locus ita expoliatur ad regulam & </s>
            <s xml:space="preserve">libellam, ut amu-
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            ſiumnõ deſideretur, ſupraq́ eius loci centrum medi-
              <lb/>
            um, collocetur æneus gnomon, indagator umbræ, qui
              <lb/>
            græceσΧΙαθήρας dicitur, huius ante meridianã ar-
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            citer horam quintam, ſumenda eſt extrema gnomo-
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            nis umbra, & </s>
            <s xml:space="preserve">puncto ſignanda, deinde arcino didu
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            cto ad punctum quod eſt gnomonis umbræ longitu-
              <lb/>
            dinis ſignum, ex eoq́ acentro circuma genda linea
              <lb/>
            rotundationis. </s>
            <s xml:space="preserve">Itemq́ obſeruãda poſtmeridiana iſti-
              <lb/>
            us gnomonis creſcens umbra, & </s>
            <s xml:space="preserve">cum tetigerit circi-
              <lb/>
            nationis lineam, & </s>
            <s xml:space="preserve">fecerit parem antemeridianæ um
              <lb/>
            bræ poſtmeridianam, ſignanda puncto. </s>
            <s xml:space="preserve">Ex his duo-
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            bus ſignis circino decuſſatim deſcribendum, & </s>
            <s xml:space="preserve">per
              <lb/>
            decuſſationem, & </s>
            <s xml:space="preserve">medium centrum linea ꝑducenda
              <lb/>
            adextremum, ut habeatur meridiana & </s>
            <s xml:space="preserve">ſeptentrio
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            nalis regio.</s>
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