( 531 ) 



or 





10 



V 7' 



== 1 



This pivos ^'— = 0,203. hence 7^ = 0,04:)7V 



Tho maximum is found from 



G, — '~^' = - 0,8 ; y.^ = 1 y, — 0,0 IM 7',. 

 This is satislied l»_v /9, = 0,1025, hence y, :z:j 0.022.S 7'^, ,/, ^ o,(mi12 7',. 



Wy'j = —0,014 — 0,(K)(i —0,20 -0,30 —0,35 —0,38 —0,40 



r. Hence wlien we draw near to tlie limiting case 7\ = 7\, all 

 fonr cnrves will e\idently approach to the sli-aight line 7,='/,, 

 \A liich cuts the angle of the coordinates in two equal i)arts. Fig.5 is 

 to a certain extent already a representation of this case. 



If, however, 7\ is verv small, so that '^Vy^ ai)i)roaches to 0, then 1 

 passes evidently into the straight line 7i_=_£^' 'I '"^'^ 'h = -Vi : 

 HI into 7, := 0, so into the '/^-axis ; IV into 7^ = — VJ\ = 0, so 

 again into the 71-axis. Of this tig.O gives alread}^ an idea. 



As to the two maxima and the two points of intersection, we 

 have tiiially the following summary. 



.1/, 



r,/r^^ = 0,1 0,5 0,9 110 0,1 



75/7-1 = 4 ï^2 M 26,2 

 71/ j^ = 4 4,0 4,2 12,4 



0,5 



0,0 1 



00 



0,0012 0,20 8,2 00 

 0,0228 1,13 20,3 00 

 S. 



7-2/7^^ = 0,1 0,5 0,9 1 



9^/t, — 8 7,6 5,9 5,85 4 



71/7; — 4 4,0 4,2 5,55 4 



.And in this way 1 think that the ideal case « = 0, «' = has 

 been suflicientlv elucidated. 



35 



Proceedings- Royal Acad, Aniüteidam. Vul. VI. 



