C ^335 J. 
A coincidit, 8c fie evanefcit iprdinata F D , tunc ipfii 
Minima jacet in Axe A K, 8c femiparametri quan- 
titatem adequabit. Hoc eft in illo cafu n = tan- 
turn ; in nihiium abeunte at abfciffa ad ordinatam eva- 
nefcentem pertinenta. Si ergo AL = n = t r, fumpto 
pundo D inter A 8c L , fiat A D = x ; turn oritur 
r r * 
FL^ = w.4-xx, ergo FL^— AL=xx5 
4 . 
hoceftFL ^ — AL'i = AD ^ Temper. Ejufdem- 
que tenoris eft Theor. 2. Lib. 7. Conicor. de La Hire. 
Secundb fit curva quasdam ordinis Parabolici fupe- 
p — q q p 
riors, cujus seqnatio r x = y. 
2 p . 2 q 2 q 
P P 
Turn yy = r x , adeoqus 
2 p — 2 q 2 q— p 
: 2q p p . 
2yy = — r x ' xj fubftituendoque hunc»va- 
p 
lorem loco 2 y y in ^quatione generali determinante z ad 
2 p*— « 2 q 2 q — p 
q p p 
tremum, habemus inde n = — r • x ' + x r 8c 
p 
2p— *2q 2q-^p 
q P P 
propterea fubnormalis D L == — r x 
p 
Xxxxxxx 2 
Hoc 
