G. PLARR ON THE SOLUTION OF THE EQUATION Vptp=0 ‘ 79 
Mv, = (@—h,)e 
= (w—hy)[Ar/e + ve, | 
parallel to M’v, = [rA»/ Qa & | = Vos 
- de ; 
The expression of 5, owing to E—W=0, becomes infinite, a circum- 
stance which explains the fact of the junction of the two sheets, the surface 
being tangent to the cone E = A, along the curve of contact. 

4aays | ply 
Ideal Section | tom at «=e, for infinitely near that point only. 
that axis, but here the tangent plane affects two definite positions, owing to 
the meeting of the two equal circles in the one point. e=é, . 
