336 



WAVE ANALYSIS. 



[Exp. 



8. Tabulating. These values should be placed in the Table, 

 after being multiplied by the sine of the angle shown in the first 

 column; thus, s x denotes the algebraic product of s t and the sine 

 of 10, or, s l = s i X 0.1736, etc. 



Write the algebraic sums of the first columns (i, 3, 5, 7, 9) on 

 line I., and of the second columns (17, 15, 13, n) on line II. 



The line (I. + 11.) is found by adding line II. to line I. ; the 

 line (I. II.) is found by subtracting. Dividing these results by 

 9 gives the values of A 1} A Z , A 17 and B 1} B 3 , B 17 , as shown 

 in the last two lines, which may be substituted in equation (i). 



9. Check. As a check on the computation, the following rela- 

 tions should hjold, each constant being given its proper sign : 



A 7 +A Q 





B 



13 



TABLE (18 ordinates). 



Calculate C\, C&, Ct, etc., as in equation 2a. 

 Calculate 0i, </> 3 , 0s, etc., as in equation 2& 

 Calculate a 3 , a 5 , etc., as in equation 40. 



