378 



TABLE 374.— COMPOSITION AND ELECTROMOTIVE FORCE OF VOLTAIC CELLS 



(concluded) 



Part 4. — Standard cells 



Clark Zn + Hg ZnSO« 



Weston II Cd f Hg CdSO, 



Paste 



H 2 SC>4+Hg 

 Paste 



CdSC>4+Hg 



1.434 

 1.0185 



Very low temperature coefficient. 



TABLE 375.— DIFFERENCE OF POTENTIAL BETWEEN METALS IN 

 SOLUTIONS OF SALTS 



The following numbers are given by G. Magnanini for the difference of potential in hun- 

 dredths of a volt between zinc in a normal solution of sulfuric acid and the metals named 

 at the head of the different columns when placed in the solution named in the first column. 

 The solutions were contained in a U-tube, and the sign of the difference of potential is such 

 that the current will flow from the more positive to the less positive through the external 

 circuit. 



SMITHSONIAN PHYSICAL TABLES 



