ANALYSIS OF CURVES. 



435 



To confirm the result a check reading was taken in 

 each case, thus : 



= 12 3 = 36. 



Thus we get cos 36 = ^ = '8116 



1Q.K 



and sin 36=^= '587 



Now from Tables we see value of cos 36 = '8192 and sin 

 36 = -5878. 



As both of these values are within 1 per cent, of being 

 correct we may consider the result satisfactory, consider- 

 ing that the readings from the curve were only taken to 

 1st place of decimals. 



5th Harmonic. 



Cosine Term. 



Sine Term. 



A check reading was again taken as before, and found 

 to confirm these results. 



First Harmonic (Fundamental) Cosine Term. 

 When = 30 = 50=0 



Cos = 1 Cos 3 = 1 Cos 5 = 1 



