432 On the Electrical Resistivity of Electrolytic Bismuth. 



Fia. 3. 



n \r 



600,000- 

 300,000- 



400,OOO- 



.-^ 300,000- 



S 



| 00,000- 

 ^ 



JO O,000- - 



f Resist iw 

 of Elect ro/y 

 transfers 



00 



- /50 -/00 50- +0 



Temperature //? decrees centigrade. 



a certain temperature at which the bismuth has a minimum electrical 

 resistivity, and, therefore, a zero temperature coefficient, and that 

 the temperature of this turning point is higher the stronger the 

 transverse field. These curves also show that at a temperature of 

 about 150 C., the bismuth would probably cease to have its resis- 

 tivity affected by a transverse magnetic field.* 



In conclusion, we desire to mention the assistance we have received 

 from Mr. J. E. Petavel in the work described above. 



* Drude and Nernst (' Wied . Ann.,' vol. 42, p. 568) found that, with a transverse 

 field of 7000 C.GLS. units, the total percentage increase of resistance of electrolytic 

 bismuth was 22'0, 8'0, TO, and 0'4 per cent, respectively at temperatures of 16 C., 

 100 C., 223 C., and 290 C. 



