VOLTAIC POTENTIAL DIFFERENCE BETWEEN CONDUCTORS. 



8l 



TABLE 25. Voltaic contacts, Al-Zn, Al-Cu, A1-A1. Four-sec, intervals (usually) between 

 observations for V. Scale part cm. =0.092 volt. 1^0 = 0.0454 cm. Positive needle. 

 Radium I to V. # = 36.1 Xio + 8 . 



* After further 60 sec. 



FIG. 29. Variation of potential (cm. of scale) in the lapse of seconds for 

 aluminum-copper, aluminum-zinc, and aluminum-aluminum condensers. 

 Subscript zeros show the earthed metal. 



