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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)
# Folio 669, page id 851387705:0689
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OMMII
PrOB. II. De Calculo Centri Cravitatis.
Superticiei Cylindrica rel Prismaticae, aut quae horum instar LUME;
Centrum Graritatis, c in media loncitudine.
Nempe; Linea Rectae, in Puncto medio: Parallelogrammis in me-
dia Recta oppolitis basibus parallela: Parallelepipedi, Prismatis,
aut esindri, vel Superticiei Cxlindrica vel Prismarica; in medio
Plano, oppolitis basibus Parallelo.
2
l.
Adeoque: Parallelosrammi, in ejusmodi binarum Rectarum concurtu: C.
Parallelepipedi, in ejulmodi erium Planorum concurtu.
Datur isicur Puncti, Linea rectae, Ouadrati aut cujusris Parallelo.
sranimi, Cubi aue Parallelepipedi cujulris, horumre solidorum cu.
jutris Superticiei, Contrum Graricatis.
Adeoque e Punctorum quotlibet, positione datorum, commune Cen-
trum oxaritatis datur. Item, Rectarum quotliber, magnicudine et
positione datarum. Imo, et linearum quarumlibet, magnitudine
e politione datarum, quarum singularum Centra gravitatis dantur,
datur commune Centrum Craritatis. Ope Prop. UIE. C ap. 4.
Fit similiter, quotlibet Ouadratorum vel Parallelogrammorum quo-
rumlibet; icem, quodlibet Cuborum, rel quorumris Parallelexipe
D
F.
dorum; aut superticierum horum; (magnitudine e positione da TI,
EOTUM;) datur commune centrum Graritatis. ODC ejuIdem PFOD. TFT,
Linex Rectae Parallelosrammi, Parallelexipedi, Pritmatis, Cxlindri,
8
a
ult. Cap. 4.
t
Fig. 12
08.
109;
6
aeguali incervallo ab invicem distiris, poliuilque i litu ad horizontem rectis; in
Teomenta invicem aequalia (plura an pauciora, numero tinica an infinica,) diridi:
Manisestum ostu (ex (3 Cap. 3. vel 4 Cap. 4.) Propter segmenta quoribet ex una
Parte, tocidem ex altera, A. qualia magnimame, (decoque d Condere, 
mus urique aequabiliter graria:) e in Distantiis respectire aequalibus polla, A
quiponderare linonta sinoulis respectire lumpris; adeoque omnibus oma limul
Tumpra. Adeoque, quod per C tranSic, eAt A. GULIMLI Les penaM, vet LCpE
diculare Planum; (per detiniriones Cata; Det 13
 enim intelligatur Linea Recta, Parallelogrammum, Prisma, Cylindrus, que A.
D quod horum instar est aliud; urirsguie a medio Ci; Rectis Planitre parallelis,
Adéoque; (per 26 Cap. 4.) in Linea Recta, hinc determinacur ipsum Bunctum; B.