Manchester Memoirs, Vol. liv. (1910), No. l3. 17 



this kind we have only so far made with direct currents as 

 tabulated below : — 



Table VII. 



Relation between Area and Resistance. 



Hand to Hand. 



Subject— H. P. Volts— 20-6. 



These results when plotted give the curves shown 



in Fig. 5. 



Resistance zvith Metallic Cojttacts. In the cases when 

 ordinary metallic contact is made, as usually occurs in 

 practice, the values of the resistances will obviously be 

 very much higher. A number of measurements have been 

 carried out by the two methods, with a view to obtaining 

 results under conditions most likely to obtain in work- 

 shops. The nature of the numbers to be expected is 

 indicated by the following results : 



