Clavius, Christoph, Geometria practica

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169139LIBER TERTIVS. culi applicetur, & eius latus CE, circa C, paulatim at-
100[Figure 100] tollatur, deprimaturue, donec radius viſualis per la-
tus interius normæ C E, incedens ſeratur in punctum
extremum B, diligenter que notetur punctum F, in
quod radius viſualis per alterum latus interius C D,
tranſiens incidit.
Et quoniam A C, media eſt 11coroll. @.
ſexti.
portio nalis inter A F, quæ in partibus baculi nota effi-
ciatur, &
diſtantiam AB: ſi fiat,
22
Vt A F, inter baculum, & pun- \\ ctum F, cognita # ad baculum \\ A C: # Ita bacul{us} A C, # ad A B,
Hoc eſt, ſi quadratus numerus baculi per A F, diuidatur, prodibitin Quotiente
diſtantia A B, nota in partibus baculi.
2. Non absre ſoret, ſi duo clauiculi in vtroque latere normæ interioriaffi-
gerentur, vt radius viſualis per illos incedens rectius in B, &
F, feratur.
ALTITVDINEM turris, aut alterius rei per normam inueſtigare.
PROBLEMA XXXII.
1. IN ſigura præcedentis problematis ſit metienda altitudo G H. Figatur
rurſus in A, loco menſoris baculus AC, cuius ſummitati C, angulus rectus nor-
mæ applicetur, eiuſq;
latus CE, paulatim eleuetur, deprimaturue, donec per la-
tus interius CE, vertex altitudinis H, conſpiciatur punctumq;
F, in quo alterum
latus CD, incurrit, notetur.
Et quoniam ducta recta CI, Horizonti parallela, tri-
angula ACF, HCI, æquiãgula ſunt;
ꝙ anguli A, I, recti ſint, & ACF, HCI, reliqui
ex rectis ACI, HCD, (ſi nimirum communis auſeratur DCI,) æquales:
ſi fiat. 334. ſexti.44
Vt bacul{us} \\ A C, # ad A F, inter bacu- \\ lum, & punctum \\ F, cognitam # Ita diſtantia CI, vel A G, quæ \\ nota ſiat per aliquam menſu- \\ ram. # ad IH,
procreabitur IH, nota, ad quam ſi adij cietur longitudo baculi AC, vel GI, pro-
poſita altitudo GH, cognita erit.
DISTANTIAM in plano Horizontis, quæ non ſit valde magna, alio
modo facillimo dimetiri.
PROBLEMA XXXIII.
1. Qvando planum aliquod exiguam habet longitudinem, ſed tamen
menſurari non poteſt, ob aliquod impedimentum, cuiuſmodi ſunt latitu dines
101[Figure 101] fluminum, &
ſtagnorum quorum latitudines, quas
nunc pro longitu dinibus accipimus, menſurarine-
queunt, ob interiectã aquam, vtemur inter alia hoc
etiam artificio.
Properipam fluminis, aut ſtagni, vel
alterius cuiuſcunque reimetiendæ, figatur baculus
A B, ad Horizontem rectus cui in puncto B,

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