Vitruvius; Philandrier, Guillaume - Gvlielmi Philandri Castilionii ... In decem libros M. Vitruuii Pollionis de architectura annotationes

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121103IN LIB. III. uidetur, quarum vna pars & ſemis, Abaco relinquatur,
ex reliquis octo, volutæ constituantur, ſed ita vt in quin-
ta, quam magna eſt, ducatur circulus, qui oculus dicitur,
eo modo cumerit deſcriptus, ab eius centro ad Abacum
imum, erũt partes quatuor & dimidia, ab eodem deorſum
verſus, partes tres & dimidia, Per centrum deinde, per-
pendenti lineæ reſpondens linea tranſuerſa agatur. Eas
lineas vocat Tetrantes, quòd efficiant quatuor lineas pa-
ribus interuallis distinctas. Collocato igitur pede circini
immobili in oculi centro, duc pedem mobilem à Tetrante
qui ſab Abaco eſt, in proximum Tetrantem extrinſecũ,
prior linea longa erit partes quatuor & dimidiam, ſequẽs
eritlonga quatuor, à qua agetur linea in tertium Tetran-
tem cuius linea non amplius demittitur, quàm ſunt partes
tres & ſemis, à qua in quartum Tetrantem circũacta li-
nea non longior erit quàm ſunt partes tres. Rurſus agi-
tur linea in primum Tetrantem, vbi ab Abaco imo diſtat
partes duas. Deinde in ſecundum Tetrantem, vbi à cen-
tro oculi distat, partes duas, post in tertium Tetrantem,
vbi interuallum est partium vnius & ſemis, inde in quar-
tum Tetrantem, vbi diſtat à cẽtro partem vnam, poſtre-
mo in primum Tetrantem, vbi conuenit cũ oculi circun-
currente linea. Vides de Tetrante in Tetrantem minui
quantum eſt medii oculi ſpacium, idest quanta eſt me-
dia pars vnius earũin quas diuiſa eſt perpendens linea.
Illud autem ſcitu dignum eſſe duximus, in periſtyliis, aut
locis eis qui per ambitum parietibus adpactas habent co-
lũnas, non eſſe eandem angularium, quæ cæterorum me-
dianorum capitulorum rationem, Alioquin, nonnullæ in
cauum ædium latus haberent obuerſum, cum omnes,

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Scan	Original
91	73
92	74
93	75
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95	77
96	78
97	79
98	80
99	81
100	82
101	83
102	84
103	85
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107	89
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