178 Prof, Cumming on Thermoelectric Relations, S)C, [Sept, 



Electromagnetic Relations of different Substances with Copper 

 Wires ; the Magnitude of the Substance examined being greater 

 than that of the Copper Wire, excepting those marked *, none 

 of which exceeded half a Grain in Weight, 



Postive Series. 

 Bismuth, 

 Mercury, 

 Nickel, 

 Platina, 

 Palladium, 

 Cobalt, 

 Silver, 

 Tin, 

 Lead, 

 Copper, 

 Brass, 



Solder (common), 

 Pewter, 



*1 nickel -f- 1 iron, 

 4 tin -i- 1 antimony, 

 Galena. 



Negative Series. 



^Iridium and osmium, 



Rhodium, 



Gold, 



Zinc, 



Arsenic, 



Iron, 



Antimony, 



1 bismuth + 1 tin, 



1 zinc + 1 tin, 



1 zinc + 1 lead, 



4 zinc + 1 antimony. 



Printer's type. 



Fusible metal, 



1 ditto + 1 arsenic, 



*1 nickel + 1 palladium, 



* 1 nickel -f 2 platina, 



tl bismuth + 1 zinc, 



Sulphuret of antimony, 



Charcoal (boxwood). 



Plumbago. 



•f The compound of bismuth and zinc, it is well known, is not an alloy, yet it acted 

 natively whether the heated part appeared to be zinc or bismuth. The compound ore 

 of iridium and osmium was from Dr. WoUaston : the alloys of nickel from Dr. Clarke, 

 formed by the gv blowpipe. 



