Ze 



( 248 ) 



7. ;A^A-ifr. 



= 1, 



or 



so wlicii 



or 



'^'^ '^' ~ Y~/ ^ ^"•' ^^ ' - ^^ = ~ ^'^^^' ' 



Vi 



l-A 



— 3,092 



.ƒ, = ^-^ + 0,908 (T, = 0). 



(^>) 



The qnantily (f., will l)c x (sccoikI liiiiiliii,t;-valiie, as -f may 



2 



have all values u[» to x ), when 



1 2 7. 



i. e. when 



2 if, I-;. 



4A 



= 0, 



<ri = 



1— ;. 



{<P, = co ) . 



(5«) 



It is evident tiiat the (lilference between the two limits of (f, 

 is exactly 0,91. 



We have now the Ibllowinu' siirvev for dillerent values of )•. 



From this we see, that if, == -f may have all values from to 



Qc, hut that the values of if,^=^ are limited to an interval, which 



T 

 varies with tlie value ofP. :=— ^. The greater A becomes, i. e. the more 



^ 1 

 2\ approches to 7\, the smaller this interval comparatively becomes; 

 so the value of 71 required must then become larger and larger. 



All this applies to the case that the minimum disappears at the 

 same moment as in the case of tig. (). It is easy to see that when 

 the minimum disappears he/ore the case of tig. 6 the \alue of t/ , 

 will have to be hinjcr than that which is determined by (4) for 



