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

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10082GVL. PHIL. ANNOT. tia linea à ſumma perpendiculari ad extremam pla-
nam. Collocato Circini pede ſtabili in puncto extremo
planæ, ducito ad aliud ipſius punctum quod in centro ocu-
li est, pedem mobilem, & circũagito dum lineam attingas
quæ ducta eſt à ſumma perpendiculari ad extremam pla-
nam. Id circinationis diuidito in parteis ſex æquas, & à
puncto planæ, ad perpendicularem ducito lineas rectas
per ſex illas partes. Quod interuallum erit inter ſingu-
las, partieris in quatuor, ducens item lineas à plana ad
perpédicularem, vt in ſex aliis feceras. Ductis his lineis,
nota puncta vbi attigerint perpendicularem, & iiſdem di-
stingue angustam chartam. Hanc vbi ad veram illã per-
pendicularem transtuleris, & in oculi centro acicula affi-
xeris, vt circũagi poſſit, vbicun ea puncta in circũactio-
ne reſponderint ad extremum vſ, ii erunt termini Vo-
lutæ, & craſſitudo corrigiæ, ſeu Baltheum dicere mauis,
ſenſim in finem imminutæ quantũoportet. Reliquum erit
in octantibus Cicli, ideſt lineis quibus primùm admonui-
mus octo ſecandum oculum, reperire, vnde ductus Circi-
ni mobilis pes ab octante in octantem, rectas circinatio-
nes efficiet. Nam locum præſcribere, non ita licet, cum
in multis eiuſdem lineæ locis, plerun id fieri poſſit.
Hoc poſſam monere, initium capi ab intrinſeco octante
plano, deinde ſur ſum verſus per reliquos octantes fieri
circinationem. Inter pendentes vtrin Volutas, ſcalpi-
tur Echinus ouiculis vſ ad libramentum ſummi oculi,
cum ſcalpto Baccis Aſtragalo ipſius tertia parte.

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