174 DE MOTV CORPORIS 

 Ergo C — — ^(A-|-B)-^„'-^-7p ; tum yero eft 



■L' 2i "T m{nii — 1 )• 



39. Definitis his binis condcV.nibus C ct D 

 et fada fubilitutione tan:'em nancifciraur : 



cx quo angulus 2XYrr(J) ex hac formula diffe- 



rentiali definiri debet <^(P::r(~-\)C:zis)s fi"® ^iac 

 7A^_ dt T/ ^ ^■"— ^ — ^^— — _i_ ? L \r 



«H-' — (jui— i)(i— s;) • '•^ >> 2n l.(7i-+-Jj»"T-(«_iJ« ''~<nn — i>sj Id 



Pro tcmpore autem habctur : 



7 I -1/ ('"' — ss)ds ,> 



d^ — laVft! a. — s f ea 



T 1 t/ / \J -t/ "i(nn-i)'(i-js) / A , B \ t 



dt-^a^ ma. [nn-x^ds : V^ — j^-^— ^ ((-TTI? + (T--7lO- 0- 

 D^ ?;/(?/« yi/p^"?" conoide hjperboJico. 



40. Hic cafus ex formulis generalibus deducl- 

 tur ponendo /rr« \t fit v—u—na, proditque hy- 

 perbola circa ambos fbcos A et B defcripta cuius 

 axis transuerfus eft zz na ., exifknte « <^ i , tum \e- 

 ro haec hyperbola circa axem rcuohita id conoides 

 generabit , in cuius fuperficie corpus 2 mouebitur ; 

 Perfpicuum autem eft formulas praecedentes ad hunc 

 cafum transferri , fi ibi loco « et j- fcribatur — » et 

 «^r. Quare pofito 



R;^y('^-^(A(r-«J^ + B(r+«-}- [^"^J') 



