LAWS. — COEFFICIENTS OF SELF-INDUCTION. 



2G7 



being to obtain a balance between a known E. M. F. and the P. D. 

 between the terminals of a resistance through which a current of 

 known absolute magnitude was flowing.* 



In order to obtain sensitiveness at the final balancing, a condenser 

 one microfarad in capacity was inserted in shunt with the galvanometer, 

 the discharge of the condenser serving to increase the deflection. 

 The galvanometer was of 3,000 ohms' resistance. A telephone was 



"Tin 



ho'' to*' $0. /oo lie ihq' 



FigS Armatur'b B .True Sine Curve Dotted. 



/to* 



/to' 



used to obtain the preliminary balance. In Table I. are given the 

 results of the determination of the wave forms of both dynamos, one 

 section of 10 wires being used. In the case of armature A (movable) 

 a series of checks is appended. The whole series was gone through 

 with and then repeated in the reverse direction, the person making 



* Telegraphic Journal, 1874, II. 317. 



