Benedetti, Giovanni Battista de, Io. Baptistae Benedicti ... Diversarvm specvlationvm mathematicarum, et physicarum liber : quarum seriem sequens pagina indicabit ; [annotated and critiqued by Guidobaldo Del Monte], 1585

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DE PERSPECT.
ab cuius rei ſpeculationem, imaginatione con
figure: 188
[Figure 188]: CORPOREA.
cipiamus lineam .b.c. corpoream, protractam eſ
ſe vſque ab .y. lineæ .s.e. & imaginatione ſit com
præhenſa linea .y.o. et .b. R. parallela eidem, ideo
ob rationes iam dictas de figura .A. hæ tres li-
neæ .o.y: i.c: et. R .b. ſimul cum linea .o.b. eruntque
in vna eademq́ue ſuperficie plana, quae cha-
racteribus .y. R. notemus .et .i.c. eius ergo ſe-
ctio communis cum planum, in quo quæritur pũ-
ctum, et .f.k. ipſius plani cum triangulo .o.b.m.
ergo ſectio communis, & parallela ipſi .q.d. eg .
6. lib. 11. quia .k.f. perpendicularis eſt ſuperfi-
ciei .p.t. eg .19. eiuſdem cum triangulus .o.
b.m. eidem ſuperficiei .p.t. eg .18. eiuſdem
perpendicularis exiſtat. Vnde perſpicuè pa-
tet ratio quare protracta ſit parallela .b.c. et
quare lineaque ſit .i.c. et coniuncta .x.m. cum .x.
p. directè, & quare lineaque ſit .o.m. et .f.k. Lau-
do igitur vt ſemper præſupponatur .p.x. perpen
dicularis baſi ipſius plani & præſupponatur, (vt
rem totam vnò verbo complectar) ſuperficies .
p.t. perpendicularis planum, & orizonti. quem
reliquum eſt, neceſſarivm non eſt, niſi ab ſpe-
culandum. Neceſſariæ erit non ſunt aliæli-
neæ, quàm.p.x: p.o.x.i: b.c: et .x.m. è dire-
cto coniuncta cum .p.x. (quæ .x.m. coniuncta
figure: 189
[Figure 189]: SVPERFICIALIS.

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