of Electro-Magnetism by Heat. 
TABLE I. 
A List of Subtances heated at one extremity, in contact with Copper Wires ; 
the Wires being small in comparison with the Substance examined, ex- 
cepting in the cases marked *. 
Positive. 
Bismuth. 
Mercury. 
Nickel. 
Platina. 
Palladium. 
Cobalt. 
Silver. 
Tin. 
Lead. 
Copper. 
Brass. 
1 Nickel + 1 Iron*. 
1 Tin+4 Antimony. 
Solder (common). 
Pewter. 
Galena §. 
Negative. 
Antimony. 
Iridium and Osmium*. 
Rhodium. 
Gold. 
Zinc. 
Tron. 
Arsenic. 
1 Bismuth + 1 Zinct. 
1 Bismuth + 1 Tin. 
1 Zinc +1 Tin. 
1 Zinc + 1 Lead. 
4 Zinc + 1 Antimony. 
1 Nickel + 1 Palladium*. 
1 Nickel + 2 Platina*. 
Printer’s Type. 
Fusible Metal. 
1 Ditto+ 1 Arsenic. 
Zinc + Tin + Copper f. 
Sulphuret of Antimony §. 
Plumbago. 
Charcoal. 
* None of these specimens weighed more than J a grain. 
+ Not an alloy but a mixture, yet was negative whether the heated part appeared to be 
zine or bismuth. 
A magnetic compound, capable of polarity, composed of copper two atoms, zinc and 
tin each one atom.—From Mr. G. Spillsbury. 
§ The sulphurets of lead and antimony alone were examined, probably other sulphurets, 
phosphurets, &c. would give similar results. 
Vol. Il. Part I. I 
