Michelson and Stratton — New Harmonic Analyzer. 9 



of finding for any given function the coefficients of the cor- 

 responding Fourier series. 



Thus if f(x)=a n -\-a 1 cos x-\-a 9 cos 2x-\- 



we have a& = — I fix) cos kx dx 



■if™ 



11, 



O 



o 



-e- 



N CM 



■a <s 





^ 



<lm 



On the other hand, if n is the number of an element of the 

 machine and a the distance between any two elements, and the 



