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



14. Experiments were then carried out on a platinum-foil 

 ligament sealed into an exhausted glass vessel shown in fig. 8. 



Fig. 8. 



Platinum-foil *001 inch thick. 



As before, two of the connexions sealed through the glass 

 carry the current, and two are potential-leads and carry no 

 current. The degree of exhaustion of the vessel was not 

 known; but it was a high vacuum from a good mercury- 

 pump, and much better than that obtained in the vessel of 

 fig. 4 from a mechanical hand-pump. 



15. Fig. 9 gives the results of experiments on the effect of 



oi % 0*2% 0-3% 0«4% 



the air temperature on the resistance of the strip, the abscissae 

 being as in fig. 5 percentage corrections to reduce to an air 

 temperature of 15° C. Two points are noticeable in this 

 diagram. The effect of the air temperature becomes negligible 

 for much lower current-densities in the highly exhausted 



