Related Properties of Crystalline Bismuth. 145 



line curves refer to the case parallel to the chief crystallo- 

 graphic axis, the dotted curves to the case at right angles to 

 this axis 



Fig. 3 is drawn fenn the values in fig. 2, and coordinates 



Fig. 3. 



-2fl0 Hfitf HVi -8<f -40° 0° 43° 



temperature with percentage change of resistance for four 

 different field-strengths. The specific resistances for the two 

 directions and in zero field for the several temperatures are 

 given in Table II., together with values obtained by van 

 Everdingen * at ordinary temperature. 



According to Ever din gen's observations the ratio of the 

 specific resistances for the two directions at 15° C. is as 1 : 1*68, 

 whereas for the crystal plate used by me it is as 1 : 1*78. The 

 ratio of the thermoelectric forces with respect to copper for 

 the two directions parallel and perpendicular to the crystallo- 

 graphic axis was found to be 1 : 1*91 (between 10° C. and 

 90°C.)t. 



* E. van Everdingen, Comm. Phys. Lab. Univ. Leyden, lxi. (1900). 

 f L. Lownda, Phil. Mag. October 1901. 



Phil. Mag. S. 6. Vol. 5. No. 25. Jan. 1903. L 



