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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)
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e
N IC
PROP. XI
De Cuneo Parabolico.
CF d et libet hoc subjungere de Prramidocide Parabolico. 
(in Cono) Rectangula B DS aequalia lunt Ouadratis DO: Si oi-
nes recta BD ducantur in omnes DS, (hoc cA, s super La
n
APB, erigatur Prilua Cusuo al  A3, Vel 13,) henc intinita
numero Parallelosramma B D S aequalia cotidem Ouacratis DO:
Hoc es, Prramidocides Parabolicum (cujus basis SE Ouadratum PO)
aquatur Cuneo seu Prismati A P BS, (quem Cuneum Parabolicum libet
appellare.) Omnia enim BDS rectancula in Cuneo (ips BPS P2.
rallela) sunc ipla rectangula BDS in Cono desienata. Ideoque et
torum toti aequatur, et quidem segmenta illius analosis sesmentis
hujus.
Incellixendum aurem est, Alcicudinem Cunei (perpendiculari ab aeie AS ad
oppolicam basin B P S demicta aestimandam) eandem ele debere acque Alricu-
dinem Conoideos.
PROP. XIT.
De Parabolae Latere. Recto.
Anitestum est, (per ea quae dicta sunt) datis rectis DB, DS
Vt hoc est, DB, AS; dari etiam DO (ordinatim applicatam ad
diametri punctum D) ue quae est inter illas media proportionalis:
AC non contra; Nam e manifestum est, mensuras illas prOrTIS extra-
neas esse (extra Parabolae planum constitutas) ex ommino accident
rias, (non minus quam, in mulciplicatione, numeri Factores ad nu-
merum Factum, qui ab aliis etiam Factoribus, infinitis modis raria-
tis, produci postit:) Portunt enim binx rectae DB, DS, infinitis mo-
dis rariari, iisdem interim manentibus tam Diametro Parabola quam
ad illam ordinatim applicatis; (l nempe qua ratione angetur vel di-
minuitur PS vel AS, latus Paralleloerammi APS, cadem e contra
minuatur vel augeatur PB latus criansuli AP B.) Ouod quidem
cousque verum est ut quaelibet Parabola cuilibet Cono accommodari
POsTIE: (quod mox, ex abundanti, demonstrabimus.)
Ne isitur nulla sic determinata mentura, lineis ad iplam Parabo
lam peculiariter pertinentibus exprimenda, qua ordinatim- applicata-
rum maxnicudo explicetur: LOc0 rectacum DB, DS, hoc eAt D  AS.
(quarum