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# Title: [Johannis Wallis S. T. D. Geometriae Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis] Johannis Wallis S. T. D. Geometriæ Professoris Saviliani, in Celeberrima Academia Oxoniensi, De Algebra Tractatus; Historicus & Practicus. Anno 1685 Anglice editus; Nunc Auctus Latine. Cum variis Appendicibus; Partim prius editis Anglice, Partim nunc primum editis (shelfmarks Leibn. Marg. 100:1/2, Stück 2; Leibn. Marg. 100:1/2)
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Det 
C O N O - C, W N F 1 5.
letis rectas eo aequales Ordinatis illius Elliplis in Solido FIS. XE, cujus AXiS
CIEnd
85. Tum diridatur Pn in rOF aequales parres in punctis co, quot sunt partes in-
aquales in a L. EE a Sinsulis punctis co, ducantur rectae ad n aut L respectire. HX re-
cta abscindene in respectiris parallelis 85, (primam in prima, secundam in secun.
da, e sic deinceps; numerando puncta co ab E, ec parallelas ab ;) rectas 50 aequa
les quasitis Ordinatis in Curra propolita.
86. Denique. Ducatur recta S d F19. 24, 25, aequalis ilsi in Solido, gux elL pro-
POLiX Currae diameter. Ec diridatur, in punctiss, in cocidem aequales partes, quot
tune inaequales in n F. Et ad lingula haec puncta p, applicentur ad angulos rectos
rectae 50, aequales illis super rectam a L. constituris, (ex eodem vel concrariis 12.
ceribus iplius sd, prouctime illae ad a L.) Ft, per punctas, ducatur (ductu re-
sulari) Curra qua ab illis indicatur. P ltque haec Curra, cadem ipla quae prodi-
ret expolici Solidi sectione, a Plano quod rectae sd insiltat ad rectos angulos Re.
Etangito ADBB.
87. IdCM DErFICCTEEUE, OpC unIIS TrIanGIIORM AMIF. F15. 13. Parallelis inibi
bis sumpris (propter ealdem in urroque Guadrante Ordinacus;) e dividendo F.n
in toridem parres quot prius.
88. Si Batis ASD sic FMiplis; proceltus idem erit ac pro Circulo. Si autem Lic
Parabola, Fyperbolas aliare Curra: Rectan L, qua jam diriditur ut L inca OF.
dinacarum in Circulo aequalibus intersticiis sumprarum; cum dividenda erit ut li
nea ordimatarum limiliter Cumptarum in ca Parabola, Hyperbola, aliave Cuira;
CujuS AXIS Sic A D. Religuulque procestis exiona mutatione pertieietur.
80. In toro aurem tactenus Progrectu supponimus Paralle logrammum ABDC
esse Rectansulum; _ Ouadrantem CD O, cidem insiltere ad angulos rectos; et
Priansula AC, aRS, urisque planis illis recta; adeoque expolicum Solidum,
Frectum este, non Scalenum: Planumque quo Tolidum hoc
rectos eidem Parallelogrammo AB D C insiltere. Sin aliquod eorum qua luppo.
nunus Rectangula, toret Obliquangulum; Sectiones inde prodeuntes, torent ali-
quatenus ab his diversa; pariter ac Sectiones Coni Scaleni, aur Lrecti sectiones
obliquae, divertae sunt a Rectis Sectionibus Coni Recti. Sec dehis Casibus nolo
ultra procedere: Contencus Sectiones Perpendiculares Frecti Solidi consideralte.