"• 'k~-''-^-^i9^^p-p^9)~ripdr~-rdp} = dp; 



III. "^-^^zzrirdq-qdr^-piqdp-pdq^-dq. 



Deinde vero fcqiientes formulae etiam commodam redu- 

 (flionem patiuntur. 



I. '-p-'4^=^dp{pdr-rdp)~dq{rdq~qdr) 

 — - r [d p^- -\- dq--\-dr^-), 



= -p{df--\-dq'- -\-dr), 



III- '4^ - ^' = dr {rdq -qdr)^dp {qdp - pdq) 

 — - - ^ {dp^- -\- dq' -\- d r'). 



Practerea vero hae redudiones notatu dignae funt: 



[-u'^'il = dr^--\-rr{dp^-^dr-\-dr^), 



'a^-^iir^ -dr-\-pp {df 4- d q- -^-dr), 



'd.-^^d-^r-^-qqi^fr-^dr-^-dr^y 



Tab. IL §, 27. Dcnique quoniam omnes has determina- 



S* 9' tiones perduximus ad parallelepipeda circa axes principales 

 exftruda, cuiusmodi in hac figura exhibetur, vbi, prouti 

 ternis lateribus OP, O Q, O R certi valores tribuuntur, 

 dingonales O fl pofitionem redarum notabilium ad cur- 

 vam pcrtinentium repraefentant: quae haflenus hic funt 

 allata fequentibus parallelepipedis compledi licet. I,) Si 

 parallelepipcdi latera ftatuantur 



OP ^ jr; Q=/i O R = 5;j 



diago- 



