M7 



■+- Sqrdm xd • h SUrdmdt — S^rpdmdt = o 



v r 7 dt ' dt 



d P 

 — Sp rdm X d ■ — — -t-SUqdmdt — Srpdmdt = o 

 r dt l ' 



de plus les equations rVQ -i-q'dR = o, / JP — p'dR = o 



erant divifees par ^ r , & enfuite differentiees donnent ( a 



caufe dedP = o,dQ = o,dR = o) 



,,dQ ,,dR ,. dP ,, dR 



r d ■ —± -had- — — = o ; r d ■ — p d - — — = O ; 



dt 7 dt dt r dt 



d' oil F on tire 



dt r' dt' dt r 1 dt 1 



ces valeurs fubftituees dans les equations ci-devant , on a 



[ ( S r* dm -f- Sfdm) ?- — Sp q dm X ^ — Spr d m] 



X d • —— -h St rdm dt — S^T q dm dt = o, 

 dt ' 



[ - (Sr*dm -+- Sp*dm) ^- ■+• Spqdm X £ •+■ S q r d m] 



X <£'•. -j K SUrdmdt — S^rp dmdt = o, 



[ S />'<//« -+- S^^/n — S qrdm X *L — Sp rdm X £• ] 

 X </• -— -+- SUq dm dt — Sirpdmdt = o, 



& en diminant J • — , 



( S r* dm-*-Sq* dm)p —S p q dmXq —Sp rdmXr 



Spqdm a />' — (SfMw f Sp*dm)q' \ Sqrdm X •"" 



$• ty qdm — S it rdm 



S-irpdm — Sx\r dm 



