( 79) 



. „ , Slope of temp. 14 



Masuetic field. 1 



4. Generally these results differ rather considerably from those 

 of VON Ettinqshaüsen and Nerxst. The gaWanomagnetic difference 

 of temperature is smaller and increases nearly in proportion to the 

 second power of the strength of the field instead of the first. The 

 HALL-effect is larger — larger even than has ever been observed 

 in bismuth — and increases more with the magnetic force. For 

 the thermomagnetic difference of potential we find in the weaker fields 

 even another sign than was observed before ; only in the stronger fields 

 the sign agrees again with the observations of vON Ettingshausen 

 and Nernst; accordingly the effect, when positive, increases more 

 than proportional to the first power of the magnetic force. 



Probably the most important cause of this difference is the diffe- 

 rent purity of the bismuth ; also the circumstance, that my bismuth 

 was deposed by electrolysis may have some influence. 



The behaviour of the alloys of bismuth and tin may now serve 

 in order to indicate which bismuth is purer. VoN Ettingshausen 

 and Nernst experimented upon bismuth, considered as chemically 

 pure, and four alloys with increasing quantities of tin. They found: 



a. The galvanomagnetic difference of temperature has a maximum 

 in the alloy with 1% of tin. In the alloys the increase is less than 

 proportional to the fiist power of the magnetic force, in bismuth it 

 is almost proportional to the magnetic force. 



b. The HALL-constant is in the alloys much smaller than in 

 bismuth ; the relative decrease with increasing magnetic forces grows 

 with increase of the quantity of tin. 



c. The transverse thermomagnetic effect is largest in bismuth ; the 

 longitudinal thermomagnetic effect on the contrary has a maximum 

 in the alloy with lo/„ of tin. The increase in the alloys is less 

 than proportional to the magnetic field ; in bismuth it is nearly 

 proportional to that field. 



Hence in respect to a and b my bismuth and the alloys differ 



