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# Title: [Johannis Wallisii SS. Th. D. Geometriae Professoris Saviliani Oxoniae, Tractatus Duo] Johannis Wallisii SS. Th. D. Geometriæ Professoris Saviliani Oxoniæ, Tractatus Duo (shelfmark Leibn. Marg. 103)
# Folio 49, page id 85138403X:0065
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DE CrCLOTDE
30. Ouod quidem omentum , D= P, si ex Parallelogrammi
BC mOmentO ZD PX Z D = , D= P auferacur; manebit  DE 
momenrum erilinei B cC respectu ejusdem Bb. (Idem urique
aeque momentum erilinei Bb C respectu ejuIdem Bb.)
3r. Quod denique crilinei BcC momeneum, per ejusdem
magnicudinem = D P = Z D. divisum, dat
8 P = 16
di-
ctanciam ceneri graritaris dicri BC C eritinei d recta Bb. GuX
icaque est ea PArSFCCEX B C = = D, que CMad FOTAM E D, UE 2 P
ad 8 P in F6 D, CVC = D 2d 2 P  4D; hoc eA, UE AF 2d
4 A F  4F C. Ouod _ 26 propoluimus inquirendum.
32. Hlabica vero distancia ceneri gravitacis crilinei BCC à
Bb; adeoque porrionis alcicudine super idem gravitaris cenerum,
Quippe distantix quae ilti aequalis est, proprer alcicudine marima
aequalem maximae diltancix, adeoque et seliquas reliquis, uepore
proxorcionales;) nempe
D 
8 P= F6D. Si haec alticudo in batis
maenicudinem ED P = Z D= dueaeurs habetur = D = P disX
porcionis prismatis (erilineo B C C infiltentis) mienicudo: (Xequa-
lis quidem momenro supra invento.)
33. Eiuldem reroporcionis prisiatis (crilineo B cC insisten-
eis. Momencum, his pallibus inrestigamus. Si super Pemicirculum
FB C Fg. L. erigatur semicplindri porcio, qualis F cC YZ
fig. 5. alticudinem habens in F nullatr, in C VeTO C CL C F.
Semicirculus basis est SD P; hic in alcicudinem super CenErO
graricatis plani, hoc est in Z D, ductus, dac ia D. P inaenicudi
nem expolica porcionis Semielindei.
34. Hujus vero portionis Semicplindri, cenerum gravitaris
distat à plano in F eangence, secta F g= ZD (UE SuPEA 5 57;)
quxe diltantia in magnicudinem = D P ducta, dac, 2 D. p
momencum expolicx porcionis semicxlindri respectu cangeneis
in F, hoc eAt F A fg. 1.
35. Ix hac vero semicylindri porrione, auferamus primo eamm
iltius parrem quae quadeanci F Y Z H9. 5. iWhltic, (hoc est, qua-
Oranti F C BFg. T. vel 7.) cujus magnicudinem primo, deinde
momencum, sic inreltigauS.
36. Quadrantis F Y Zf9. 5. centrum eravieatis, a recta X2,
distat
F18. 50