DE 



MOTV GRAVIVM CITISSIMO 



SVPER CVRVIS SPECIE DATIS. 



AuGtorc 



L. E F L E K 0. 



P r o b 1 e m a i. 



Duis ;in phno horizontali pun<flis A ct B, inue- 

 nire eum arcum circularenri APB fuper quo 

 '^* ^' cpj^pus ex A defcendendo citiffime in B peru&niat. 



. Sol u tio. 



Bifeda diftantia A B in C fit ACr:BC=r^, 

 ac per C duda verticali P O fit O centruni arcus 

 quaefiti , eiusque radius 



OAzz-OV—r erit PC— r-V(rr-tfa)— /», 

 \t fiat r :^ ifj±-P^, fumantur coordinatae orthogonales 

 VX-x,XY-zy, erit j'-V(2r^-.vA0::V(?l±^l^-:t^), 

 et clementum curuae — ^^^;f^^^^ , quare cum ce- 

 leritas in Y fit — V (p ~ ;t) erit elementum tem- 

 poris 



^ l — r dx 



' ' V ( f — x){zr X — XX) ' 



jta repraefentandum 



,j t — r d X cuius 



" ■"■ i{px — xXi{,2r — a) ' 



