17-1 .MI'I.KS. 



1 (luldinns's thr.nvm i'<r finding the volume <.f 

 a ring t<> the rase in which tin- ring is formed by tin- WTO- 

 o of a plane area about a straight li: '-I tx> iu 



plane. 



ring is formed by the revolution of the lemni- 

 (whose equation is ^ = 0*003 26) about a straight line parallel 

 - plane situatc-l in a plane drawn through its double 

 point and perpendicular to its axis ; shew that the volume of 

 ... . TrV 



