-tss 



W. Mason — New Harmonic Analyzer. 



as possible. From practical considerations this value 

 will be K = — -T for any smaller value than this will cause 



O /I 



the curve to extend outside of the tracing point. H is 

 taken as 3/2 h, for if it is taken any smaller, the results 

 will not be very accurate, while if taken much larger, the 

 machine tends to become unwieldy. 



A cosine curve may be obtained in a similar manner, 

 going through the same set of equations and replacing 

 tlie sin by the cosin. 



Fig. 3. 



y 



X 





Starting Po'int 



•^^ -Y 



If only the odd harmonics are to be found, then it is 

 necessary to analyze only one loop of the wave form. 

 The integral to be evaluated is 



A,j — / 11 sm n a a a, 



and if this is substituted in equation (1), a similar set of 

 instrument curves may be found for this type of machine. 

 As only one loop has to be analyzed, the instrument will 

 be only half as large. 



As stated before, the essential operation consists in 

 tracing the wave form with the intersection of the arm 

 and instrument curve, while at the same time the derived 

 area is drawn by the tracing point. It should be espe- 



