Vitruvius
,
Marci Vitruvii Pollionis De architectura libri decem : ope codicis Guelferbytani, editionis principis, ceterorumque subsidiorum recensuit, et glossario in quo vocabula artis propria Germ. Ital. Gall. et Angl. explicantur
,
1800
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M. VITRUVII P. DE ARCHITECTURA
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tes habet novem, eas umbrae facit octo in declinatione coeli, quae eſt
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Romae. </
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<
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xml:space
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">Itemque Athenis quam magnae ſunt gnomonis partes quatuor,
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umbrae ſunt tres. </
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<
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">Ad ſeptem Rhodo quinque . </
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<
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xml:space
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">At Tarenti novem ad undecim. </
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<
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xml:space
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">Alexandriae tres ad quinque: </
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<
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xml:space
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">ceterisque omnibus locis aliae
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alio modo umbrae gnomonum aequinoctiales ab natura rerum inveniun-
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tur diſparatae. </
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<
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xml:space
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">Itaque in quibuscunque locis horologia erunt deſcriben-
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da, eo loci ſumenda eſt aequinoctialis umbra. </
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<
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xml:space
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"> Et ſi erunt (quemadmo- dum Romae) gnomonis partes novem, umbrae octonae, deſcribatur linea
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in planitia, et ex media πρὸς ὀρθὰς erigatur, uti ſit ad normam, quae di-
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citur gnomon: </
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<
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xml:space
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">et a linea quae erit planities, in ſinem gnomonis circino
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novem ſpatia dimetiantur; </
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<
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xml:space
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">et quo loco nonae partis ſignum fuerit, cen-
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trum conſtituatur, ubi erit litera A; </
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<
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xml:space
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">et diducto circino ab eo centro ad
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lineam planitiae, ubi erit litera B, circinatio circuli deſcribatur, quae di-
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citur meridiana. </
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<
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xml:space
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">Deinde ex novem partibus, quae ſunt a planitia ad
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gnomonis centrum, octo ſumantur, et ſignentur in linea quae eſt in pla-
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nitia, ubi erit litera C. </
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<
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">Haec autem erit gnomonis aequinoctialis um-
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bra; </
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<
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">et ab eo ſigno et litera C, per centrum ubi eſt litera A, linea per-
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ducatur, ubi erit Solis aequinoctialis radius. </
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xml:space
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">Tunc ab centro diducto
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circino ad lineam planitiae aequilatatio ſignetur, ubi erit litera E ſiniſte-
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riore parte, et I dexteriore in extremis lineis circinationis, et per cen-
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trum perducenda linea, ut aequa duo hemicyclia ſint diviſa. </
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<
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xml:space
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">Haec au-
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tem linea a mathematicis dicitur horizon. </
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<
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xml:space
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">Deinde circinationis totius ſu-
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menda pars eſt quintadecima, et circini centrum collocandum in linea
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circinationis, quo loci ſecat eam lineam aequinoctialis radius, ubi erit li-
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tera F, et ſignandum dextra ac ſiniſtra ubi ſunt literae G, H. </
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<
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xml:space
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">Deinde
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ab his et per centrum, lineae usque ad lineam planitiae perducendae
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ſunt, ubi erunt literae T, R; </
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<
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">ita erit Solis radius, unus hibernus, alter
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xml:space
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">Cod. Guelf. quindecim.</
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*)
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">Forma IV. 1, 2.</
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