326 Mr. J. H. Vincent on Models and Diagrams to 



The curve 2 is a section of the surface by a plane parallel 

 to ZOY and at a distance 2 from it. 



Section by Plane a=2. 



Inner section a point, the origin. 



Outer. 



X. 



y- 



0-00 



2-98 



0-50 



2-93 



1-00 



2-77 



1-50 



2-47 



2-00 



1-90 



2-16 



1-50 



2-27 



1-00 



2-27 



0-50 



2-24 



o-oo 



