ft 88 DE OSCILLATIONIBVS 



o=A-P-r-Q.i o—B-Q-f-R; o=:C-R + S; 



o — D-S 



ex quibus ftatim fingulae tenfiones facillime definiun- 



tur , fcilicet 



S^D; R— C+D; Q=B4-C+D et PrA+B+C+D ; etc. 



hinc ad ealculum contrahendum ponamus breuitatis 



gratia 



Z-—i + ?-*" c ~ h 2=:* hincerit %ri B -±^ fc °:=a--i 



A A A A 



|-» ;+ 2. -y -^ » -y_« 



jL— i r=£ etc. etc. etc. 



JD 



§. 4. Quod II iam pro applicatis 7, y, j 11 

 itemque pro tenfionibus P, Q, R, S etc. fuos fcriba- 

 mus valores, adipifcemur fequentes aequationes diffe- 

 rentiaTes fecundi gradus : 



II. **iZ^*d&3— Sq + tf-^r 



IIL «^P+^d^cddr ,. r , tV — X) J 



t g d t 2 • * 



Sicque totum negotium ad refolutionem harum ae- 

 quationum differentio-differentialium reducitur, quae 

 vtique artificia prorfus fmgularia poftulat. 



§. 5. Quia in omnibus his aequationibus va- 

 riabiles p, q, r, s etc tantum -vnicam tenejt dimen- 

 fioaem, euideus eft, his aequationibu. fatisrleri pofle t 



& 



