Vitruvius, De architectura libri decem, 1567

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349317NONVS. frorum, & horarum portiones in ſemicir culis notentur numeris horarium antiquarum. Estoq́; ſemicirculus
Capricorni inferius x y. Cancri ſuperius z & . & ubi in diametris ſemicirculorum deſinunt horarum
lineæ, ponatur litera n. ut igitur meridianas circunferentias pro latitudine eliciamus, ducantur lineæ a cen-
tro e. quæ per ſigna n. traiectæ ad meridiani a b c d. circunferentiam perducantur. Verbi gratia :
153[Figure 153]Horologia in plano meridiani.6 5 4 3 2 1 7 8 9 10 11 12 u l d 7 4 8 3 9 2 10 b n n n n n 5 4 3 2 1 a c e c y n n n n n p 1 2 3 4 5 n ſ ſ 4 3 2 1 r 4 3 2 1 e 4 3 2 1 B 9 10 11 12 13 14 e H 5 6 7 8 9 10 11 e E g r 7 6 5 4 3 2 1 F g d 23 22 21 20 19 18 18 c g G d f a b e g c 1 2 3
4 5 4 3 2 1 8 7 6 5 4 3 2 1 f D e 11 10 19 1811102220333044405550 Ducas occultam lineam ab c. centro, quæ per n. ſignum boræ primæ, & undecimæ ad o. ſignum in cir-
cunferentia perueniat. arcus a o. erit arcus primæ, & undecimæ boræ, ideſt circunferentia meridiana
item ſi ab e. centro per n. ſignum lineæ horæ decimæ, & ſecundæ lineam duxeris ad circunferentiam, ad
6660

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