Clavius, Christoph, Geometria practica

Table of handwritten notes

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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,
reperietur recta I N, ex qua ſi dematur I H, ſtatura menſoris, nota relinquetur
99Altitudinis
inuentio.
HN, vel EF, altitudo quæſita.
Et ſi rurſus fiat,
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.
nota fiet diſtantia NL; à qua ſi ſubtrahatur NF, vel HE, quam metiri licebit, co-
1111Diſtantiæ in-
uentio.
gnita relinquetur FL, diſtantia à perpendiculo montis.
Vel ſi dematur NM, dif-
ferentia ſtationum, nota relinquetur diſtantia ML, à turri vſque ad L.
Item fiat.
12124. ſexti.1313
Vt IP, ſin{us} \\ tot{us} # ad P Q. Tangen- \\ tem maiorem: # ita IN, paulo ante \\ inuenta # ad NL, diſtantiam,
inuenietur rurſus diſtantia NL, & c.
2. Vervm ita eſſe T Q. differentiam Tangentium ad NM, vel H G,

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