the Electrical Resistance of Bismuth. 

 (3) Compressed Rods. 



345 







W. 



K. 







Tempera- 



Electrical 



Variation for 





Bismuths. 



tures. 



resistances 



1° between 0° 



E . 







in U.S. 



and 100°. 







f20-6 



01300 









It was observed that the electrical resistance 





was permanently changed each time the rod 





of bismuth was heated. Finally, after having 





been heated from 0° to 100°, and been al- 



Classen II. 

 1st rod. 



lowed to cool from 100° to 0° several times, 



\ constant values were found. We cannot tell 



what is the cause of this considerable decrease 





in the resistance, but it is certainly not due 





to an alteration of the connexions. 









0-1250 









22 



01215 



-0-00049 



10 3 x 23696 





^99-4 



01189 









f20-5 



0-1353 







Classen II. 



Same observation as above. 



2nd rod. 



\ o 



0-1352 









| 21-9 



0-1302 



-000083 



10 3 x251'26 





^99-3 



01241 









( o 



0-1019 









18 



0-0978 









998 



0-0913 







Classen II. 



It is allowed to cool slowly. 



3rd rod. 



* 1 0-1024 | 1 





99-7 0-0916 1 -0-00105 10 3 x 268-10 





A further investigation showed that the re- 





^ sistances then remained constant. 



Alloys with Tin. 







W. 



K 





Alloys. 



Tempera- 



Electrical 



Variation for 







tures. 



resistances 

 in U.S. 



1° between 0° 

 and 100°. 



R . 



1st. Rods slowly cooled. 





Latest Brommsdorff 

 bismuth -4- Sn. 



i 0° 

 19 

 I 49 

 I 99-6 



0-2670 

 0-2710 

 0-2715 

 0-2623 





10 3 x 458-71 



0-5 gr. Sn to 100 gr. Bi. 









f ° 



0-6790 







Bi Classen II. 4- Sn. 



16-7 



0-6917 





10 3 x 416-66 



0-53 gr. Sn to 100 gr. Bi. 



149-6 

 [995 



0-6890 

 0-6540 







2nd. Tern 



pered Rods. 





Latest Brommsdorff 



bismuth 4- Sn. 



0-5 gr. Sn to 100 gr. Bi. 



J 17-7 

 149-3 

 L99-7 

 1 ° 



01960 

 0-2020 

 0-2083 

 0-2095 

 0-1795 





10 3 x 34602 



Bi Classen II. + Sn. 



J 17-5 



01844 





10 s x 354-61 



0-5 gr. Sn to 100 gr. Bi. 



149-2 

 199-7 

 f ° 



0-1905 

 01915 

 0-2561 







Bi Classen II. -f Sn. 



] 16-7 



0-2637 





10 s X 349-65 



0-53 gr. Sn to 100 gr. Bi. 



1 49-9 

 199-5 



0-2735 



02780 







