328 PROFESSOR KELLAND ON THE THEORETICAL INVESTIGATION OF 



^01*. 2 ( . ir(p + f)g . 



T> 7 \ sm \, s 



) I 



~~yV (/ +/) 2 



. . 



1.2^2 sm T> 7 sm sm 



= I O 6 2 A 2 



2* vi i 'u / iu '/i i // ~r / i v " *7T P ' 9 i ^y ) I 

 sm =;- ^f- J Jy sin - f i cos -=r- ^ , 

 X b X 6 X o > 



Now the total intensity is the double integral of this expression between the 

 limits oo and oo of p and q. 



But 





Z 7T 



b 



..,, T (/>-/) 



and total intensity = - -^^ J^ dp - 0+2 



/-, 



total intensity = - 353 



a . 



and it remains only that we find the value of this integral 

 We have 4 sin -IftQ* sin !L#* cos 



