--S^i ) 30 8 ( !?€-- 



examinare; et quoniam , fi momenta Yt cognlta fpedarc 

 velimus, ex tribus aequationibiis 



A~ry-~qz, B— p z — r X et C — qx — pjj 

 ipfas vires p, q, r definire non licet, in fubfidium voce- 

 inus nouam quandam aequationem, quae fic 



px + qy + rz — kvj 

 itavt k- ^^-^Y"^'""' exprimat vim ex viribus p, q, r, fc- 

 cundum diredionem Os refultantem ; vnde cum ex piiori 

 fuperiorum aequationum fit r~^-5-=-, ex tertia vero 

 q-pjlj±c^ hi valores in noua aequatione fubiUtuti praebent 



^ — .fcT^z-f-Bz — Cy. 



Hincque porro coliigetnr: 



q — IZiZztL^.^^ ct r 



V V 



§. 24. His valoribus inuentis contemplemur etiam 

 vim refultantem pro ipfa dire(flione motus, quae vocari 

 folet vis tangentialis. Sit igitur ea rz / , eritque 



# _- pdx -hn^dy-i - rdz 



vbi valores modo inuenii, fi fubfiituantur, praebent 

 vvtdszzkv{xdx -\-j dy -^ z d z) 



+ A ( ydz -zdy)^'^ izdx -xdz) 4- C [xdj~ydx). 



Cum nunc fit 



xdx-\-ydy-\-zdz — vdv\ 



tum vcro 



ydz-zdy-d^j^d^, z dx ~ x dz-d^/Bd$ ct 



xdy-jdxzzd^fCd^, 



his 



