231 
The curves whose equations have thus been determined can 
be traced either from the intrinsic or rectangular equations; in 
des : 
the case when p> gor a series of equal detached ovals is 
obtained whose longest diameters all lie on one straight line, 
perpendicular to BC; and as the curvature continually di- 
minishes from the point where ¢=0, to that where $= ee 
the diameters parallel to BC are the least, and those perpen- 
dicular to BC the greatest. In the second case when p< : ov a 
(1) (2) 
