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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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Corpus part OM partim CC
repraesentans, Creometrice consideratum.
Sectimes CONO- CVNL. B
Ectangulo CDBA. Fig. T. ad rectos angulos crixatur Circuli Oua-
drans COD; junctaque  A complearur Triangulum rectangulum
COA. Scipponantur item a lingulis punctis Peripherix Guadrantalis
DQ, ad respectira puncta rectae B A, in planis Triangulo CO A
Parailelis, ductae rectae Sa, Curram superticiem complenres DS. ( A a B. I Solidum
lic terminatum, vocamus, Cono cuneum.
iolsso
2. A quadrancali Conon in hoc dittert; Ouod, quae hie est linea recta AB, est
illic Punctum unicum: Propter rectas omnes, ab S ductas, in A puncto verticis
COCHNLCS.
A Cuneo aurem, inhoc distert; Ouod, qui hic est circuti Ouacrans C. OD,
etE illic Rectangulum Parallelogrammum.
4. A quadrancali Cylindro, dittere; Quod, quae hic cstrecta Linca AB, est issic
Circuli Ouadrans, aequalis de paralsela ip(i C OD.
5. Solidum hoc, Planis in rario sicu potiris, lectum; extribebit, in curra Su-
perticie DO AB, rarias masna diverlirare Lincarum tormas. lexempli gratia.
6. Primo. Si secetur Plano RS a, Parallelo ip(i C. 9 A triangulo; linea S a exit
(per constructionem) Recta. Adeoque, Hyporenusa crianguli rectanguli S R a.
7. Ecu consequenter; Cono- cuncus hic, est aequalis Semulti quadrantalis Cylin-
dri ejuldem Balis ec Alticudinis. Nam lingula Friansyla SR a in Cono cuneo
sunc dimidia Rectansulorum respectire tumpiorum ip Cytincro; adeoque porum
eorius dimidium.
8. Magnicudines inibi concenras, ego sic per Species delixno,
CS =CD = R.
CR ==C.
RS =5 = V: R LC
Ra == C A = A. 1 C 17iil.L.
CellASi
c
8. 2
5a = V: A + 5. = V: 2 + R L 0.
9. Faec Triangula (Planis aequaliter invicem distiris Facta,) projecta in Pla-
num C O A, cui parallela Cunt; comparebunt, ut in Projectione prima, Fis. 16.
Ouxe sic delineatur. Deseribatur Friangulum AC C, limite e xquale illi in 50.
lico. e C. OD circuli Duactrans. Diridatur C D in quortibet parres aequales in
punctis R. Ad quorum lingula, ductis Ordinaris RS; his aequales sumantur, in
rectque CO, rectae C su RS. Juncti(que AS, Friansula S R A vel sC A in hoc Pla.
no, reoraelentant Friangula S R a in Solido.
20 Si siovonacur Solidum deortum continuari, intra Ouadrantalem Balin, eti-
am Frianoula smilicer continuanda eruns. Paricerque, Si luxponatur Turlum con-
cinuari, (Dost decullationem in AB,) ut tir in Conis opposiis.
EX. Magnicudines in hac Projectione, lic detigno in Speciebus,
RFFFZ