IN COaPOKA SVBIECTA. 3ii 



vndc crgo crit 



^ -_ M , Cj p_-h X ) g\ A /an^. ^^ 



~ i_t_XX (i_f-XX)Vi-+-pp' 



^2 2. Qiio hiinc cxprefllonem commodiorcm 

 reddamus , introdiicamiis in calculum ampHtudinem 

 arcus curuae A Y, cuius mcnfura eft angulus An Y, 

 duda fcilicet normali Yn;ac ponamus ilUim angu- 

 luir. A n Y — CP , et cum fit (ubnormalis 



erit tang. cp = |„ hincque tang. ( 90' — Cf) ) — p, vnds 

 patet cffc A tang. p — 90° — Cp. Sicque erit 



gX9o» 



« — ^ — f X vp • 



Et nunc pro fiiAore conftante Ce^^"" fcribamus D* 



eritque 



z — — r^-T -h- ■ , , — - = =/ Udx 



i+XX (i+xX)Vi4-/>p ^ 



tum vero hinc porro habebimus 



__ M M( Xp-i) 'DCKp-i)e-'^^ 



fiue 



/ , X D(X/)- I )e-'>'^ 



I-4-XX (i + xx)yi -\-pp 



Ac fi cundcm valorem in formula pro tenfionc in- 

 venta fubflituamus, fiet tenfio r — Dt— ^^; vnde cum 

 in ipfo initio A tenfio fit co^^nita rrrM, ibique fiat 

 (p— o,crit Al— -D, vnde difcimiis clTe D = -M, 

 Tom.XX. Nou.Comm. Ss ita 



