Clavius, Christoph, Geometria practica

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9060GEOMETR. PRACT. quando filum perpendiculi ex centro pendentis illi lateri adhærebit) & dio-
25[Figure 25] ptra attollatur, donec per pinnacidio-
rum
foramina ſignum L, cerni poſsit.
Nam arcus inter dictum latus, & lineam
fiduciæ
in dioptra angulum obſeruatio-
nis
meti@tur.
Intelligatur quoque filum
perpendiculi
in vtro que ſitu Quadrantis
penduli
, vel latus quandrantis ſtabilis ad
Horizontem
rectum productum vſque
ad
baſem montis, aut turris ad M, N.
Sũ-
ptis
deinde rectis æqualibus K O, I P, pro
ſinubus
totis, ducantur P Q, O R, ad IN,
1128. primi. KM, perpendiculares, quæ parallelæ e- runt plano Horizontis, hoc eſt, rectę NL;
& Tangentes angulorũ obſeruationum
I
, K Ipſæ autem HN, GM, altitudini 2234. primi. æquales erunt.
Et quoniam in triangulis
I
N L, K M L, anguli recti N, M, ſunt æ-
quales
, &
ILN, minor quam KLM, pars
toto
;
eritreliquus N I L, reliquo MKL, maior, ideo que & Tangens P Q, Tan-
334. ſexti. gente O R, maior.
Abſciſſa ergo P T, ipſi O R, æquali; quia eſt vt IP, ſinus totus ad P Q, Tangentem maioris anguli obſeruationis, ita IN, ad NL: erit per-
mutando
, vt IP, ad IN, ita P Q, ad NL.
Eademque ratione erit, vt K O, ad KM,
hoc
eſt, vt IP, ad IN, (cum K O, KM, ipſis IP, IN, ſint æquales) ita OR, hoc 4434. primi. ita PT, ad ML;
at que ideo erit, vt PQ, ad NL, ita PT, ad ML. Quia ergo eſt, vt
tota
P Q, ad totam N L, ita P T, ablata ad M L, ablatam, erit quo que 5519. quinti. T Q, differentia Tangentium, adreliquam NM, differentiam ſtationum, 6634. primi. NM, HG, æquales ſint.)
vttota P Q, ad totam NL, hoc eſt, vt IP, ad IN. 774. ſexti. obrem ſi fiat.
88
Vt
T Q, differentia \\ inter Tangentes an- \\ gulorum obſeruationum # ad N M, vel H G, diffe- \\ rentiam ſtationum: # ita ſin{us} to- \\ t{us} I P, # ad IN,
1010
Vt
T Q, differen- \\ tia Tangentium # ad N M, vel G H, differen- \\ tiam ſtationum: # ita P Q, Tan- \\ gens maior # ad NL, di- ſtantiam.
12124. ſexti.1313
Vt
IP, ſin{us} \\ tot{us} # ad P Q. Tangen- \\ tem maiorem: # ita IN, paulo ante \\ inuenta # ad NL, diſtantiam,

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