( 562 ) 



+ r 





hr 



(13) 



Tlie situation of tiie [(oiiit ot' intersection ,ï is (leterMiim-d liy the 

 equation : 



li + D^r — (I (14) 



By (11) and (12) : 



B — óh'v.l)=i — 'lh'r (15) 



ii'^^ = ^,2 (16) 



With the lielp of {V\^) we tind from these values: 

 , = r (1 + 4.-»/.) . 



: — ^^ = 1.89 . •' = y.'iö 



(171 



1' /) — n II 



By means of the values r or .y, to l)e taken from Tahle 111, the 

 constants of form (5) as well as tlie position of the point of inter- 

 section can, therefore, be determined ; we choose r, so that a com- 

 parison of the calculated and observed values of */, or /'/„ may serve 

 as a criterion for the method followed in calculating the constants 

 of the empirical fornnila. 



TABLE YIII. 



Observed. 



Calculated. 



Mean 528 



1053 



