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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 673, page id 851387705:0693
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(1
DeCalculo Centri Cracitatis.
PFOD.V.
Frianeuli Paralerosrammi, Reoularis Planis Circuli, FIlipseos; vel H. D
nae Tolidaere, quae Diamectum aut Axem habet, quae libi ordlinatim-
axplicatas rectas omnes parallelas bilecat, perque omnium sibi ordi-
natim applicatorum Planorum parallelorum centra graritatis tran-
sic: Centrum Craritatis eAt in ejusmodi Diametro vel Ave quovis.
Rcque hinc datur Circulis Fllipseos, Frianouli, Parallelorrammis Re- B. D.
oularis Plani, Spliara, Sphaerocideos, Cubi, Parallelexipedi cujus.
vis, (et figurae cujuscunque quae hujusmodi plures Axes vel Diame.
rros habet in unico prncto concurrentes,) Ceherum Crquitatis.
Nrempe, in duorum pluriumre concur(i.
Fsinc item (cum prima hujus) dacur Centrum Craritatis Cxtindri, F.
Prilmatilre vel Solidi Prilmatiei cujulris, cujus balium centra gravi-
tatis dantur; (eorumque Superficierum, dummodo Perimetri BaliS
centrum craritaris dacum (iC:) Nempe; in Aris medio. Bsi e
adnceds
Portionis Circuli, Lllipseos, Parabola, HIrperbola, recta (vel pa-
Fallelis rectis) abscista; Coni Prramidis, Cxlindri, Prilmatis, Splx-
rx Sphxrocideos, Conoeideos; vel Portionis cujulris horum, plano
vel parallelis planis abscista; rel cujuscunque demum Fisura pla-
iless
3821
dde
Om enim (verbi gracia) in Priangulo, Recta à quovis angule au oppotici a
ver det. T. CaD. 4) BiseCet, per 2 8 6 Fl. V. (quam itaque tigurre Diaietrum
dico; ea tigniticatione qua Conicarum Sectiolu Caulletru ab Apollonio detini-
1 lC dicuntur:) Adeoque per lingulari CLa NTaMILaLS TranICAE; (Det.
hujus.) Pric in plano per illam rectam (D 3 Hujus,) adeogle  la lecta (quiDDe
in crialiguli plano, per 26 Cap. 4.) Centrua arablS.
Similuter oltendetur; de Figurae cujutris Planxe DiatCHO; (ut Parabolae, Lly
quae omnes parallelas rectas, planum comp CCaI.
Cumque line hujusmodi Diametri, in Friangulo cres, (sempe, a sinsulis ansu- B.
Iis ad oppolica latera;) in Parallelosrammo, Guatuor, (nempe diagonales dui
ee duae quae oppolicorum lacerum media jungunc;) in Polysono regulacis 101
de
quoF
LLateris medium rectas omnes huic laceri parallelas (Priangulum complentes,
perbolae, Ellipleos, Circuli, Parallelogrammi, Plani Regularis, ec.) ea rempe