514 r>E PRESSIONE FOMDERIS 



Nunc colligamus momciua rcfpec^u azis A B, quae 

 ita fc habcbunt : 



cx pun«rto Y~ aLy-\-^xy-\-y.yy 



Z ——ay-j^xy-\ry,yy 



jz:z + ay-^xy-\-y.yy 



» — -a.y + ^xy-{-y.yy 

 fumma — ^y-jy 



quae duda in ckmentum nrcus Li? , dat formulam 

 intcgrandam ^yaydx^ at pro toto quadrante fit 

 fydx—l^naa^ vnds qnum ir.omcntum totiiis 

 .preffionis {\i G. O P =z G. f (pofito O P zr ^) habc- 

 bimus hanc fecundam aequationem G. g — tt y <?\ 

 Dcuique pro axs A C , momcuta nafruntur 



ex momento Yzr a.x.-\-^xx-\-yxy 



"L ~. «. X -f- p .V x—y xy 



^ = - a .V 4- ^ -v A-- yxy 



z ■zz. — ».x-\-^xx — yxy 

 fumma rr 4- + (3.va*, 



quac in cbmcntum -rr^* — ^, duda , d:at formulam 

 inte^rnndam , 



V{a« — X}.-)' .'V(«» — *.s:J •'V(a« — Xi) J ^ . ■»* 



lam vcro pro totnm quadrantcm fit 

 vnde coliigitur 



Tnde quum totum momcntum flt G. A P — G / 



pofito AP"/, ccrtia acqutiio uoftra prodibit , 

 G./rr TT. (3. «% Ergo 



