Thermoelectric Properties of Crystalline Bismuth. 333 



2. For the case in which both the current of heat and 



the lines of force are at right angles to the chief 



crystallographic axis, positive values are only 



obtained for the highest temperature and very small 



field-strengths. 



Case 1 a, § 3. Although this does not differ from Case 1, it 



was thought worth while to take measurements with the 



crystal in this position. The dimensions of the apparatus 



did not admit of an extended series of observations. It was 



necessary to increase the distance between the magnetic poles 



to 3| cm., and the strongest field then obtainable was 4,400 



C.G.S. units. Table III. gives the results, and side by side 



are the corresponding data for Case 1, obtained from the 



curves of fig. 5. The two sets of results, as was to be expected, 



are in fair agreement. 



Table III. 



H. 



Case 1 a, § 3. 



Case 1, § 3. 



Temperature. 



,, 



Temperature. 



n. 



4400 

 2540 

 4400 

 2540 



} - { 



! - 3i ° 1 



4-6-80 

 +3-36 



-4 85 

 -040 



53° 1 

 -36° -5 | 



4-6-70 

 4-3-30 

 -5-70 

 -040 



Table IV. 



H. 



Case 3, >? 3. 



Case 2, § 3. 



Temperature. ;/. 

 1 



Temperature. 



n. 



4400 

 2540 

 4400 

 2540 



1 f 4-0-60 



51° 

 J 1 ! 4-0-43 



1 ii ~ 5 ' 9 



-38° 

 1 | -2-7 



53-7 j 

 -42° | 



-075 

 -005 

 -15-7 



- 7-8 



Case 3, § 3. The results are given in Table IV., and side 

 by side the corresponding values for Case 2 as obtained from 



