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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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PFOD. XXVI. De Calculo Centri Cravitatis.
26. Addicis isitur Binis Sectoribus (52F. ) 2C dCk Fd = 3 a a R= 8 + 7 BC R R F18. 194
F3CR - 4 X2 Q: Acque Binis Coni portionibus (623. ) 2 C FRF = 3bC R B
3b3CR =_; Binilque Pyramidibus (524.) 2C. KtF == = ab R3V
qua cum binis illis portionibus Coni, complene Solidum Conicum, balis quactri-
Ir
=b2: SBis binis Coni portionibus (5 25.) 4 CiFDd = Z a a 2 d R26
(qux
cum binis Prramidibus C DFF, complene, bina Solida Conica C d d FF: ) Haberur
Scomenti Porrio dddd LFFF, = 3 a d R2 Q = 3a a2 d R= Q + 2. bc R 28 3b c 
3CR 2_ = =R2G ] 2 abR3 V: a
27. Aeque hoc Additum vel Subductum (Prout Seomencum Majus, Minusre
requiratur) Semilcsmento (58.) dSd C dSd = 5 a R =9 ] Z0. a  R=G: FXhibet
Sphara Sesmenum Majus, Minulre; FSDSFR, vel FSPSFR; = 3a R =3 +
aa R.  + 3ad s  +3a n a  Q L 2bC R _ + 3 b C R 8 + 3C R R F 3V 4
= = abR3 V: a 2 - b2
28. Denique; Data Valis Semi longimdo, seu rario C5, ad CD; hoc elt, ra-
tio CB, ad CB; Ponatur ut fad T. Fritque expoticum Sphaerocideos Segmentum
Mtajus, Minulre; 80p0 8, vel a=. PZ8; = Z fa R= B) + 3faa R ? d = 3 fa4 
+3f0a2 a R= 9+ 2fBCR2 QF3fb2 C R2 8 L fe R _ + 3FR2_ =3fab R V:
a = b2. Ouod proxolicum erat inquirendum.
Caleul Synopsis.
ST. R; Dara Semidiamerer Major, seu Radius inseripta Sphaerae; C P
52. a R; Data Semidiaeter NTINOT; DS.
59. b R; Data Alcicudo supra intrare Cenrrum; C. H.
528. f R; Semi longicudo Conocideos; Ci B.
T0. B = V: Z - B=
SI. R; Angulus Rectus; rel Guadrans Peripheriae Circuli Maximi.
SEZ. 6Q
5 13. a Q maximi respondentes Sini. f = R.
527. e2
bus rectis
F3R2 D; Sphara inceBra, BPBF.
= 3RED; Hlemispharium, BBP.
L2b R2Q; ZOna Solida BI CL B,
FZBB2 R=Q; COnUS L CL F, 5 Segmentum BL. L. B.
=2a R=Q; ZOna Solida BSCSB,
+320 RQ; ConuS SCSH,
55. = 3a R Q, Semirona Tolida-
SCSP,
Segmenum BSSB.
(Semilesmencum)
57. = Za a P Q, duo Semiconi (SDDSF
2DC5,
5F4. = 3a a R =2, 
d20. 2.L
6T9. = ZCR22, (duo Sectores
dT9. -
8
ZFFCDD, scu PO
529. = 3bC R ∞, Drius 2 CFKFd d
523. F 3b6 R= 2, 2 dux portiones) 5 26.
523. = 263c 8, SCOn, 2CRtkF, (Py. (Interles.
24. = Z a b R V: a = B : duxe (ram. (mentum
d + t t
524. + 3ab R V: a 2 - b2: 626.
dux Pyramides, 2CDFF F (2 PVram.
525. F 3aa d R ~, bis, binX (FCD
Portiones Coni, 2C. DFd,
826. Hec ducla m s; sunc Phomoloex partes Conocideos.
STIFC2
(95, 19
23198
526.
Anguli, vel AECUS Ci
majo
re
ESPSF
minor
Portio.
Pyramides, 2C. R FF F,
FNemplam