Huygens, Christiaan, Christiani Hugenii opera varia; Bd. 2: Opera geometrica. Opera astronomica. Varia de optica

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page |< < (486) of 568 > >|
216486CHRIST. HUGENII rallela A B. Si verò non habeatur omnino l, recta I K in
A B incidere intelligenda eſt.
Deinde ſicut z ad n, quæ ratio data, ita ſit I K ad libi-
tum ſumpta, ad K L;
quæ ipſi A I parallela ducendaeſt, ſu-
mendaque hoc pacto, ut puncta K L ſita ſint quo ordinc
A I, ſi habeatur + {nx/z}, at contrà ſi habeatur - {nx/z}, &
du-
catur recta per IL;
ſi verò deſit {nx/z}, eadem eſt I L & I K.
Porro ut p ad g, ita ſit {1/2}o ad ſingulas IX, I Y ſumendas
in recta A I;
atque ita quoque I X ad I V ſumendam in I K
ad partes A B ſi habeatur - o x, aut in contrarias ſi habea-
tur + ox;
& ſit V M parallela A I, occurratque rectæ I L
in M:
erit jam M centrum hyperbolæ quæſitæ aſymptoti
vero, rectæ per M X, M Y ductæ.
Si vero non habeatur o x in æquatione, erit I centrum hy-
perbolæ;
ſumptisque I X, I Y ad libitum ſed inter ſe æqua-
libus, inventiſque inde punctis V &
M, ut ante, ducentur
aſymptoti per I parallelæ ipſis M X, M Y.
Jam porro ſi habeatur + mm, puncta S & R, per quæ
hyperbola vel oppoſitæ ſectiones tranſire debent, invenien-
tur ſumendo in recta A I à puncto I, ſingulas I S, I R æqua-
les m:
unde jam hyperbola data erit ac deſcribi poterit, in
qua B C erit ordinatim applicata ad diametrum, ſi {{1/2}og/z} ma-
jor quam m;
ſin verò {{1/2}og/p} minor quam m, erit B C paralle-
la diametro hyperbolæ ad quam eſt C punctum, ut hic caſu
ſecundo.
Quod ſi forte punctum S incidat in X, locus
puncti C, erunt ipſæ aſymptoti.
Si verò non habeatur mm,
erit ipſum I punctum in hyperbola quæſita.
At ſi habeatur — mm, accommodanda eſt intra angu-
lum X M I recta G N parallela I X, quæque poſſit quadrata
@b I X &
I S, vel tantum ipſi I S æqualis, ſi non

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