96 = 



Itim pTanc fiicccfriim inde fperaii pofTe. Miilto minns pro 

 fupciffcic exrpcclciie Iiccbit, qiuie pofi'o d z — p d x -i n y 

 Iiac foimula iiilegrali diiplicata fexpiimitur : 

 JJdxdy-]/ {i -i-pp-i-qq). 



§. 11. Interim lamcn totnm hoc ne^otium fequcn- 

 ti modo fiicillime ex[)edire licebil: Cum pro cuiva AU 

 deUir ao(|u itio iiiter t cL u, dutla normali U N vocctur an- 

 Tab. I. guhis A N U — Cj^, critquc ^ — cot. C|>, undc formulae pro x 

 F'g- 3- et y eiunf : xzt —v col^. J) ^t y — u -h v fin. Cp. At vero ifta 

 norinalis U N producirtur usque ad ccntrum circnli oscula- 

 toris O, ita ut recla UO fit radius ofculi , cjucni voceinus 

 m r, et cuin fit .angulus A ;i u n: Cf) -t- ^ Cj), ent anguhis ad 

 O — 9 cp. 'Q:iodfi ergo clcnicntiun curvac Uu ponanuis 

 zzz^jf, ut fit ()w=:cltyii-i-js)=:^, vel etiani 'dw—''^ 

 crit /• — / ^ 



f. 12, Confjdercmus Tiunc reorrim plcmcntnm ciir- 

 Tab. I. vao \Ju~dw et prodnc.intur r.idii ofciili OU ct Ou 

 ^'a- 4 in Y et y, ita iit fit VY —uy~v- et pcrpendicuhi 

 YZ "-jt; — z. Ilic fcilicet repraefentatur pionioiio rigiirac 

 mobilis UYZ in fitum proximum u y z , qu.i pundhim Y 

 transicitar in y p^r fp;iliolum Yyrrzdw- v ') (t , (juod 

 fimal cxpiiinit translalionem piUKli Z in z, ita ut fiL Zx 

 =i d 7U -i- v ') (p. 



5. i.j. Ilis pr.icparafis invcftic;cmu.<? primo folidit.i- 

 lcm rnrporis hoc modo ^cniii, cuiiis clcmcntum, dum fimiia 

 e\ U in u promovctur, rcpcritur, fi puiria Y et / in figu- 

 la mobiii promoveanlur pcr fpuiiola Y Y^-yy ~ov, alqtie 



clo- 



