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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 906, page id 851387705:0926
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De Calculo Centri Cravitatis.
c16. 23. Sed et sic potest construi eadem Curra.
Cap. V.
Ducta recta a B F quae tanoenei F A P occurrat in T; erie ubique Bb = A F.
Fs enim a V. VB:: V A. Vb: : a A = a V + V A. AT =YB + Vb = Bb.
SC HOZ. TV M.
TAne Cqsoeidalis spata menturam, me primus monuie (sed absque Demonstra.
LLrione) Vir NobiliA. D. Christianus Lusenius (acuri ee lasaeis ingenii Vir)
literis ad me datis S Aususti 1658: Solicitus; An id exo poltem consequi metho-
dis meis in srithmerica Insinitorum cradiris; (quas ibidem ille summe comprobat
_ collaudat;) pront me nocar ante Fecisse ( in Commereio Epistolico, tum nuper
edico, Fxist. 5 e 16.) in D. Fermatii Lsyperbolis Infinitis; (nondum ulique
Sciebat Vir Nobilistimus, id icemme secille in Cycloide; cum ille De Crcloide II
ber nondum prodierit; sed Annocum sequente 2659, una cum Tractatu Lipisto-
lari, ad illum seripio, De Curvis Rectisicandis e Complanandis.)
Ouod antam dedit ea conseribendi quae hac de re habentur in Fractaru illo
Epiltolari: Quo constaret Nobilistimo Viro, Fildem Mechodis, directo ordine,
huc perrentum iri polle; etiam cum Luero.
Post autem editum Fractatum illum P. piltolarem; acque hanc etiam Secundam
Mechanicorum partem: Dignacus cM Vir Nobilistimus (d me TOBaTUS) luam
ejusdem (Ciltocidalis Spatii) mentura Demonstrarionem (ad modum Veterum
Constructam) mecum communicare. Juam cgo (ne perirer) Cubjunsi, canquam AP
pendicem, Mechanicorum Parri Perriae (Cap. 25. prop. 2.) meamque aliam cidem
consulco accommodatum: Quas ambas inde huc cransterre jam vitum elt,s uc in
locum debirum.
906
demonstratio D. Tuvenii.
Ouod Spatia Cissocidatia b a A, B a B, B a2, ec. sint tripta respectivorum in Se-
micirculo aBa Ba B, Ba A, _c. e sic ubique. D. Fusemi Demonstratio crat
ad une sentum; (verbis nonnihil, iplo intinuante, muracis;) quam porui proxi-
me ad mentet tulalis etea.
acit A CB, semicireutus, (cui Centrum Z tans
aerincsis inde Sclua. Cusco dac proprietas, ut l ubique AC = F. F. AIque ci
enS BF) _ AV P F. Ciltoides
E prOdVCtA Ocbilinabi  L.
es dem Semicirculo (scortum tranceripio, quo ricetur linearum contusio,) circum
es ponatur ABS circule alao (Ce   lo,) cui AC
l BCO