358 Mr. W. A. Price on the Electrical Resistance of 



and the arrangement of the box are shown in fig. 4. The 

 joints between the rubber packing and the box, and also 



Fur. 4. 



BRASS Ko'DIA. 



TO PUMP 



CURRENT 

 /TERMINALS 



, PLAN OF EBONITE STOPPER 



r 025^_ 



Enlarged Plan of Platinum Strip -001 inch -thick. 



between the brass wires and the ebonite cap, were sealed with 

 stiff machine-oil before exhausting. Before this box was used 

 a smaller and thicker one had been tried, of 2 inches diameter, 

 which was found to give an appreciable lag, owing to the 

 containing box being too near the ligament. In this the 

 resistance of the filament continued to rise for 20 minutes 

 under a steady current, and had not then attained its maximum. 

 With the vessel of fig. 4 no change in the resistance was 

 observed after the current had been applied for the shortest 

 time necessary to obtain the first set of readings, which was 

 about J minute, so that there was no appreciable lag. 



11. The results of experiments on the effect of outside air 

 temperature on the conductor of fig. 4 are given in fig. 5. 

 The results were not very consistent, only a mercurial thermo- 

 meter being used, and the exact position of the curve is a 



