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# Title: Leibniz-Handschriften zur Mathematik LH 35, 13, 2c
# Folio 70r, page id 00068199:0139
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De superficie conica ejusque seltione
puncto B in lublimi posito, sit delipse per ipsum transien
recta BH
B
q qua circumdacta cirea ducatur per
circumfferentiam inculi AHC circuli vel alterius figurae planae
anquam basit
e
et descubat superficiem Conformem. jam ex plano jam
ex puncto B n
planum basees demittatur recta nonnalis
BN, et ducta recta per N, quae si placet per punctum
ali aliquo notabile baseos verb. pr. per circuluscentrum
rarseat habemus aliud planum,  BNC. Et jam puncta superficiei
conformis referantur ad hoc planum. Nimirum dato puncto Y superficiei conica
nostmalio
7
Inde agatur, YX in planum BKC et ex puncto X in BN agatur normalis XL
Et ex H acta normali in AC cempe HV jungatur BY quae transibit per X
Datur relatio inter NV et HV.
et BN sit b et BZ sit.
e
habemus y: v.
tamus
jem
fie
X
A et LXSis
sit v  XY sit y. L
n. 1scuv =bu , _Y XY ut BG ad BN Ergo
Yv
as
LPorro NV ad X ut B n ad
fiet NV = Xn: Z = co. cin suadia quibus duabus aequationibus si addatum
exnatura lineae AHC
quato expimens relationonter c et V, larum ope tollem e
TB ex hac aeq. 3. tolli poteru
G et V per aequationes I et L. et ita habebitur relatio inter X,Z, Y
quae exprimet naturam superficiei coucae conformis
sit Jam