COFFIN. — THE SELF-INDUCTANCE OF COILS. 



797 



hLzJ^B. = i.25--- = -- 



3r x x ±r x dy/2 7r <»<T 



(27) 



This formula agrees to a constant factor pres, with that of Lord Ray- 

 leigh, 9 for large values of n for straight wires ; i.e.: 



L^-L, 



-v/^-2— I 

 " V 2we~ tf\/2 



TABLE II. 



Table of Values for the Curves Q, Q lt and Q 2 , for Values of x from 



Zero to Infinity. 



Computations were carefully made for the values of the term 



3 sinh x — sin x 

 x cosh x — cos x 



(28) 



9 Loc. cit. 



