Upon Caloric as a cause of Galvanic Currents. 279 



Positive current and caloric 

 moving 



together 



in opposition. 

 9 Wn- 



cold. 

 + 



cold. 



Remarlts. 



Platinum 

 and 



Copper, . 



Silver. 



Lead. . . 



Tin. . . 



Zinc. . . 



Gold. . . 



Iron. 



Mercury. 

 Nickel. . 



Copper 

 and 



Silver. . 



Lead. . . 



Tin. . . . 



Zinc. • . 



Gold. . . 



Iron. 



Mercury. 

 Nickel. . 



Silver 

 and 



Lead. . . 



Tin. . . 



Zinc. . . 



Gold. . . 



Iron. . . 



Mercury. 



Nickel. . 



Lead . . 

 and 



Tin. . . 



Zinc. . . 

 Gold. . . 

 Iron. . . 

 Mercury 

 Nickel. . 



P. &P. 

 C. &P. 



S. &P. 



L. &P. 



T. &P. 



Z. &P. 



G.&P. 



L I. & P. 

 2. P. & I. 



M. &P. 



1. N. &P. 



2. P.&N. 



C. &C. 



s. &c. s. &c. 



C. &L. 



T. &C. 



Z. &c. 



C. &P. 

 S. &P. 



Z. &P. 

 G.&P. 



M. &P. 



M. & C. 



s. &s. 



1. s. & z. 



2. Z.&S. 

 S.&G. 



I. &C. 



C.&I. 



S. &N. 



Z. &L. 

 i. &.L. 



M. & C. 



1. N. &C. 



2. C. & N. 



S. &L. 



S. &.T. 



S.&G. 

 L I.&S. 

 2. S. & I. 

 L S. & M. 



2. M.&S. 

 S. &N. 



L. &L. 



T. &L. 



Z. &L. 

 G. &L. 

 I.&L. 

 M. &L. 



L.&N. 



rThe combination in 1st column most usual. 



< The 2nd combination difficult of exhibi- 

 ( tion. 



CThe currents not apparent unless at a red 

 2 heat. They are not inverted even when 

 (_ the silver is fused. 



C No current for 2nd column, even when the 

 ( lead is heated to fusion. 



The same as for lead. 

 ( The combination of 1st column mostpovper- 

 i ful. 



C No. 1. first column most usual. The other 



< only apparent when the iron acquires a 

 ^ full red heat; oxidation must be avoided. 



Combination in 1st column, most usual. 



C The 1st combination most powerful. The 

 \ 2nd often imperceptible. 



With cold copper, no perceptible currents. 



The same as for lead. 



A red heat necessary for the copper. 



fNo. 1. of these combinations, the most pow- 

 erful. No. 2. only perceptible when a 

 fine copper wire is kept red hot in the 

 flame and touched, without removal. 



No current perceptible when the silver is 



cold. 

 Very feeble at all times. 



No. 2, feeble. 



] 



> No. 1. most powerful. 



Hot lead no effect ; even the tin requires a 



heat near the point of fusion. 

 Hot lead little or no effect. 

 Hot lead no effect. 



Hot lead little or no effect. 



