Clavius, Christoph, Geometria practica

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143113LIBER TERTIVS. 60. pedes. Si verò a A, ponatur 1000. comperietur eadem AF, particularum
200000.
qualium 1000. in a A, comprehenduntur.
2. Post hæc deprimatur Quadratum, ita vt latus AD, Horizonti æquidi-
ſtet, centrum que dioptrę ſit in A.
quo poſito, videbitur cacumen F, per inuen-
tam hypotenuſam AF, quæ primum ſecet vmbram verſam C D, in E, vt in pri-
mo quadrato, inquiratur que portio dioptrę AE, in partibus laterum A D, D E,
116. Triang.
rectil.
quod fiet vel ex vtro que latere A D, D E, cognito:
Vel ex cognito per pro- blema 1. ex vmbra D E, angulo D A E, ex latere DE, noto: Vel denique ſi 225. Triang.
rectil.
ſumma quadratorum ex AD, DE, deſcriptorum radix quadrata extrahatur.
In-
uenta portione A E, in partibus milleſimis lateris A D, ductaque EM, ipſi A G,
3347. primi. parallela, ſi fiat,
442. ſexti &
componendo.
55
Vt AE, inuenta in partib{us} \\ milleſimis AD, # ad AF, in iiſdem par- \\ tib{us} inuentam # Ita G M, in iiſdem par- \\ tib{us} cognita, cum æ- \\ qualis ſit ipſi D E, # ad GF,
nota effi cietur GF, in partibus milleſimis lateris AD. Quod ſi rurſus fiat,
66
Vt lat{us} AD, \\ 1000. # ad 3. ped{es}, quos \\ ponim{us} in AD, \\ contineri: # Ita G F, in milleſimis parti- \\ b{us} lateris AD, inuenta, # ad GF,
reperietur eadem GF, in menſura pedum. Et ſi adiiciatur, ſtatura menſoris GI,
nota in eadem menſura, cognita fiet tota altitudo I F, in menſura pedum.
Vbi vides, nos eadem opera inueniſſe quo que diſtantiam AF, ab oculo A, ad
cacumen vſque F.
3. Secet deinde hypotenuſa a F, inuenta (inuenietur autem vt Num. 7.
dictum eſt) vtrumque latus vmbræ in C, vt in 2. quadrato. Si igitur fiat,
772. ſexti. &
componendo.
88
Vt portio dioptræ a c, inuenta in par- \\ tib{us} a d, lateris, 1000. vt Num. 2. \\ dixim{us}. # ad a F, hypotenuſam \\ in iiſdem partib{us} \\ inuentam: # Ita GK, \\ 1000. # ad GF,
prodibit GF, nota in partibus milleſimis lateris d c: Et ſi rurſus fiat,
99
Vt lat{us} d c, \\ 1000. # ad 3. ped{es}, quib{us} æquale \\ ponim{us} lat{us} d c, # Ita GK, 1000. cum æqua- \\ le ſit ipſi d c, # ad GF,
inuenta erit eadem GF, in menſura pedum. Et ſi addatur ſtatura menſoris G I,
nota in eadem menſura, cognoſcetur tota altitudo IF, in menſura pedum.
4. Tertio ſecet hypotenuſa inuenta AF, (quę inuenietur vt Num. 7. do-
cuimus) vmbram rectam in E, vt in tertio quadrato.
Siergo fiat,
10102. ſexti. &
componendo.
1111
Vt portio dioptræ A E, inuenta, \\ vt Num. 2. docuim{us}. # ad AF, hypotenuſam \\ inuentam # Ita G K, \\ 1000. # ad G F,
exibit GF, nota in partibus milleſimis lateris DC. Et ſi iterum fiat,
1212
Vt lat{us} D C, \\ 1000. # ad 3. ped{es} in D C, \\ contentos # Ita GK, 1000. cum ſit æqua- \\ lis ipſi D C, # ad G F,
cognita erit eadem GF, in menſura pedum, & c.
Atqve hac eadem ratione omnes aliæ lineæ inuentę in partibus milleſimis
lateris Quadratireuo cabuntur ad quamcunque aliam menſuram, vt ad pedes,
vel cubitos, &
c.

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