G. PLARR ON THE SOLUTION OF THE EQUATION Vp¢p=0. rile 


de —te,, 1(— P1)3 
(ar 7 ia ene 0 
therefore ¢ is decreasing when E increasing from E,, (=E,) towards h., for 
both branches. 
The normal v,, corresponding to the generating line <’ in the plane dv (for 
_ the expression (60) of e’, Me'=)(—A;)# +v(h,)#) will be parallel to 
(Mo,,)suer=0 = « [M(—hs)'—v(hn) 4] , 
that is directed downwards to—v. 
Likewise we find, in the plane pr: 
(M’v,,)srer=0 =[p(—h,)? —vh,}] { 

We will call first sheet of the surface [=0, .the one which we have 
followed from 

i Oe SS 

Section through vx . 

Se 
=<, 
( Ji, 
pe through { to 
VOL. XXVIII. PART IL U 

