Resistance of Electrolytes at High Frequencies. 541 



From fig. 3 : — 



Galvanometer deflexion due to 100 cms. wire == 110 divisions. 



„ 12-5 „ CuSO^in3crn. tube = 106 

 10 „ „ 1 „ = 113 



The discrepancy between the galvanometer readings is not 

 as small as one would desire, but the Kohlrausch bridge 

 arrangement available was rather unsatisfactory. Probablv 

 a considerable error is attributable to this. 



§ 7. Since the curves in fig. 3 do not approximate, even 

 along their middle parts, to straight lines, a trial of another 

 circuit was made — namely, that shown in fig. 4. The 



resistance R to be measured is here introduced in series with 

 a coil Y. This coil consisted of about 40 turns of No. 22 

 copper wound on a frame 25 cms. square. It was found 

 best to place it coaxial with the coil AB and close to X. The 

 oscillations of current in BOX then induce an oscillation in 

 the circuit RY, and the amount of power contributed by the 

 valve circuit for this purpose is a function of the resistance 

 R. Figs. 5 and 6 show the variation of the anode current 

 in the valve circuit as a function of R *. The curve (fig. 6) 

 consists of two branches, that on the left (lower resistances) 

 being almost perfectly straight for values of R up to about 

 400 ohms. 



This circuit is suitable for the measurement of large as 

 well as small resistances; but we shall confine ourselves to 

 the latter at present. 



§ 8. The modus operandi is as follows. Using suitable 

 resistances of the fine Manganin wire, observations of the 



* The abscissae in fig. 6 are lengths of a capillary tube of electrolyte : 

 1 cm. corresponds to 923 ohms, 



