of Electro-Magnetism by Heat. 73 
TABLE XI. 
Conducting powers of different Metals, with the same Bar and Compass. 
Tempe- 
rature. 
Platina.| Iron. 
220 : Sei ceed Wes 
195 i Diameters of the wires 
zy Inch. 
170 | 10. : 23 ; 
160 ; py, : 6 | Length 164 inches. 
140 = 
Diameters =; inch. 
Length 1 + inches. 
11.8 11.45 | 11.3 
Deviations. 
Hence the order of conductors is Silver, Copper, Gold, Zinc, Brass, Platina, Iron. 
TABLE XII. 
Deviations by equal differences of Heat, at different Temperatures. 
Temp. of extremities. Temp. of extremities. 
Hot. Cold. Cold. Hot. 
190 110 
180 107 
170 104 
153 100 
140 99 
The deviations produced by given differences of heat are therefore increased by 
raising the temperature of the whole bar. 
Vol. If. Part I. K 
