-4^1 ) 312 ( !?»<• 



Huic nddamns aequationem modo inuentam, (vide §. 26.) 

 qiiae erat 



ac manifcflum efl: prodituram eflc hanc aequationem: 



quae aequatio tantum continec variabiles t et ^, et denuo 

 intcgrabilis redditur multiplicando pcr ::.vdv: integrale 

 enim erit: 



'"-^ — zv-\-:Lfkvvdv~^ ^fv dvftdSy 

 hincque eliciiur 



^ i,2 v-i-7jk-vvdv-^*jvdvj tdi) » 



quae ergo formula cum fuperiore §. 28. inuenta congruere 

 debet. Comparatione autem flida erit 



Tvv-SS=:z.fkvv dv-^j^fv dvft ds ; 

 vbi fi difFerentietur et loco T et ^T valor ante aOiimtus 

 fcribatur , prodibit 



^Ilv V dv ::^ 'i. V V t d s — d.^^S. 



Vidimus antem efle 



SSzi:(/Mr/e)'= ifvv[tds-kdv) 

 ideoque 



d.S S — 1 V V l d s - 1 k V V d V .^ 

 quo fubllituto acquatio manifcllo prodit idcntica. 



Inue- 



