( 370 ) 



ftt+i = («'-!) IT, - (.• 5 -l) 



u = tor x = ± j 



?i(w 1) 



(6) 



2.(2w + l) 



2 -h 



+ 7 



n(n— 1 (w— 2)(w— 3) 



2.4.(2n+l)(2n — 1) 



'n = <3 fin 



n(n — 1) 



2.(2w + l) 



f*» 



»(n— l)(n— 2)(n-3) 

 " 2 + 2.4.(2n+l)(2n— l/*" 

 (2n + 8) (2n-fl)/ (2w + l)/ 



1 



22«+i (n + 2)/n/n/n/ 



+1 



(6) 



(7) 



f<„ = | ua n da 



— ï 



The use of the proposed series enables us to introduce more 

 constants than two, which, in this case, is a decided advantage as 

 the means of higher order necessarily decrease and, therefore, the 

 convergence is assured. 



For the position of the maximum-value however no definite expres- 

 sion can be derived from these formulae, and il has to be determined 

 by approximative methods. 



Values of the function R n +2 for n = to ti = 4 have been 

 calculated and are given in Tal tie X ; for the tirst term, which 

 remains the same for all curves, A R, has been given instead of R t . 



The figure represents the way in which a frequency-curve (full 



i ic ■> 



