27<J D E M T V 



qua preflio p definitiir , et quia aquam a fola gra- 

 vitate animari ponimus erit P rr o , Q— o et 

 R z: — I tum vero quia in hac aequationc tempus t 

 conftans accipitur , erit d^ z: —ff^^j}^ et (^— )-^i^, 

 ficque aequatio pofterior abit in hanc foriiiam ; 

 2.s:dp-zz- nQi d z^^U^^^ -—tlL\ ^ 



^ ^ ° ' ojS cu d f 



quae quia v et ^-^ vt conftantcs (pedlantur per inte- 

 grationem dat : 



° ^ ~ fc> 2C0U d t ^ oj 



vbi cum oj fit fundlio folius j* integrale /ii vt 

 quantitas cognita fpedlari poteft. 



Nunc ad ambos terminos noftrae maflae aqueac 

 refpiciamus qui fint in M et N exiftente AMzr.;;/, 

 ANzzw, amplitudine in MzzjJi., in N =z v , alti*. 

 tudine Mfxzzm, Nvizn, integralis /^i valorc 

 jn M zz 3}J in N zz 3?; tum vcro prelfione in 

 M zz M et in N z= N. Cum igitur celeritas in M 

 fit :zz^l^ , in N zz-^-^ , tempufculo dt ambo ter- 

 mini M et N promouebuntur in M', N' vt fiC 

 M^ M zz-^^^^^ et N N' .-rz-^ilil^ 



vnde quia m et « funt fundiones folius temporis t 

 erit ^;;/~-^i^, dn — ^^'^ hincque ^dm — ydn. 



Ex cognitis autem preffionibus in M et N has duas 

 obtinemus aequationes : 



zgM — Ait" 2gtn -fy^ -^-TT- ^ 



2 £ N z= A u - 2^ n ^4?^^^44-^ ^ 



vnde 



