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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi; Opera Mathematica] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi; Opera Mathematica (shelfmarks Leibn. Marg. 100:1/2, Stück 1; Leibn. Marg. 100:1/2)
# Folio 350, page id 851387705:0370
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DE SECTTONTBUS
CrOp. l1
3
A P P F N
Radidimus, in superioribus, trium illarum (prout vuleo dicuntur)
Coni-sectionum, Parabolae, Fllip(eos, atque TErperbolae, doctri-
nam succincte satis, sed co interim satis (ni fallor) dilucide. Pa-
rumque vel omnes vel praecipuas saltem affectiones vel demonstra-
vimus, vel saltem demonstrationum fontes indicavimus; ut inde liceat levi
necotio ea omnia deducere, quae loneis ambaeibus, atque perplexo variorum
Lemmatum e Demonstrationum intricatarum labore, antehac ostendi consue-
verunt.
Atque haec omnia brevi admodum alque suecincta methodo tradita sunt;
praeseriim si omittantur ea omnia (qua quidem tuto nec incommode omitii
posse videantur, quae tota parte prima tradidimus; quae quidem Conum spe-
etant, atque illarum ad conum relationem, cum quibus tamen praesens de-
Etrina (quanquam secus olim creditum est) nullam habet necessariam con-
nexionem; sed simplicius atque universalius tradi Cs potest c3 debet.
Sed interim viam simul aperuimus qua Curvarum doctrinam penitius in-
eueri atque ulterius promovere facile possimus: (quod e nos fortasse post
aliquando, Deo favente facturi sumus, si illud necesse videbitur, atque viris
doctis Mathematum peritis labores nostros eratos fore perspiciemus.) Inte-
rim specimen aliquod libet apponere, de curvis aliis Parabolae affinibus, qua
rum Diametri, Ordinatim applicatae, Latera recta FTanentes, 6. non m
nus quam in ipsa Parabola reperiantur.
PROP. ZL V.
De Paraboloerde Cubrcale.
T Parabolocides ita constituatur, ue Ordinatim applicatas habeat
in suberiplicata ratione Diamelum interceptarum; (adeoque
illaru C ubos diamert  et CePEIS PTOPOrtIOnaLCS:) Paraboloeides Cu
dicale at Pelett.
ginariam, Cusus Guact act t catietue cen anccetum, aequa
cur cuba Ordinatum aepcalae. OcM asceo
Latus rectum Parabolocidis cubicalis (puta ) appello rectom ima-
PROP.