3:i0 



Royal Society : — 

 Conducting Power at Temp, in Celsius's degrees. 



Silver 100 



Copper, No. 3 77-43 



Copper, No. 2 72-06 



Gold 55-19 



Sodium 37-43 



Aluminium 33-76 



Copper, No. 1 3063 



Zinc 27-39 



Magnesium 25-47 



Calcium . 22-14 



Cadmium 22-10 



Potassium 20-85 



Lithium 19-00 



Iron 14-44 



Palladium 12-64 



12 



0-884 



0-519 



0-413 



Tin 11-45 



Platinum 10-53 



Lead 7-77 



Argentine 7-67 



Strontium 6-71 



Antimony 4-29 



Mercury 1-63 



Bismuth 1-19 



Alloy of Bismuth 



parts 



Antimony 1 part . . . 

 Alloy of Bismuth 



parts 



Tin 1 part 



Alloy of Antimony 2" 



parts. Zinc 1 part . . 



Graphite, No. 1 '. 0-0693 



Graphite, No. 2 00436 



Gas-coke 0-0386 



Graphite, No. 3 000395 



Bunsen's Battery-Coke . . 0-00246 



Tellurium 0000777 



Red Phosphorus 0-00000123 24-0 



All the metals were the same as those used for my thermo-electric 

 experiments, v^dth the exception of cadmium, which was purified by 

 my friend Mr. B. Jegel. 



The alloys of bismuth-antimony, bismuth-tin, antimony and zinc 

 were determined in order to ascertain whether, as they give, with other 

 metals, such strong thermo-electric currents, they might be more ad- 

 vantageously employed for thermo-electric batteries than those con- 

 structed of bismuth and antimony. 



Coppers No. 1 , 2, 3 were wires of commerce. No. 1 contained 

 small quantities of lead, tin, zinc, and nickel. The low conducting 



24-0 



22-0 



25-0 



22-0 

 22-0 

 25-0 

 22-0 

 26-2 

 19-6 



