TABLE 279. 



CONTACT DIFFERENCE OF POTENTIAL IN VOLTS. 



Solids with Solids in Air.* 

 Temperature of substances during the experiment about 18 C. 



* Everett's " Units and Physical Constants." The table is from Ayrton and Perry's experiments, and was pre- 

 pared by Ayrton. 

 SMITHSONIAN TABLES. 



268 



