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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 319, page id 851387705:0339
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N
DM tradita sine in praecedentibus Parabola, LIIIPLIS, atque FTy-
Derbola, (quas Conisectiones appellant,) essentialia sympto-
mata, ab ipso secto Cono (unde Oricinem iaxisse existimantur
desumpta: quae ipsarum naturam absolutam tu interim exponunt,
unde continzere possit: Ft quidem undecunque contineat, absolutam earum
contemplationem neutiquant Woitutoet.
ut sive a Secto Cono sive aliunde genesm sortiantur, eadem natura absoluta
eisdem characteribus cusaa esset: Lacebit in sequenius Eacs (sid 
neas sive freutus) secundum absolutam quam in se habent naturam vonden
plari, sine respectu ad senesm habito quae del a Sectione Coni, vel etiam ali-
PRO P. ZXI.
De Parabola absolute considerata.
om sic in Parabola Ouacratum Ordinatim- apPLCala CujusIBEt
Ecriptam, lire tigulamt planam, ejulmodi curra terminatam, Puta
OAO,) cujus ordinatim applicatarum quadrata unC ItExCEPEIS aa
meeris proxortionalia.
Rectam vero (imacinariam) quae cum interceptis diametris (tan-
quam communis alcicudo) continebit rectangula (ipsis quidem dia-
metris interceptis proportionalia) Guadratis illis Ordinatim applica-
tarum aequalia, appello Latus Rectum: puta L. A.
Ordinatim applicatas vero apvello, (DO, PO,) Semisses parallela-
rum rectarum, (OO, O0,) Pacabola utrinque terminatarum (quas
Ordinatim inscriptas, vel Ordinatim subtensas appello) una linea recta
(Duta ADP, quam appello Diametrum) bilectarum.
+(p = 1a) aquale rECLAIMIO GUE MHLCLCEPA= DIAMCErO et L. a
tere recto compretienditur, (ut, inspecto Cono supra deprehendimus,
PTOD. F2.) Licebit jam Parabolam, eo charactere ornatam, (uo Cono
eximere, atque absolure quidem et Oniversaliter detinire.
Parabolam isitur appello eam (sire lincam curram in plano de-
Punetum autem illud bilectionlo, (D Vet L,) Punctum applicationis
appello; ii quo quippe Biametlo ila abplicatur ea quam Ordlinatim-
applicatam diximus.
lica compreneu (AD LLL,) Damerrum interceptam appCIIO.
Punctumque Diametri in curra illa exiltens (puta A) apPCH
Verticem.
Diametri vero seomentum, puncto applicationis ex curra Parabo-