Tlwrmoelectric Properties of Crystalline Bismuth. 339 



Tables VII. and VIII. contain the results for the range 

 0° to — 70°, parallel and perpendicular to the chief crystal- 

 lographic axis respectively. The thermoelectric force is 

 reckoned positive when the current flows from the bismuth 

 to the copper through the junction at the higher temperature. 



Table VII. — II Chief crystallographic axis. 

 a = 130-2. /3 = 0-3504. * = - ^=-185°'8. 



n 2/3 



t v 



*■>• 



e (observed) mv. 



c (calculated). 



o 



-2-3 



o 



-57-8 



59S8 



6057 



-3-8 



-66-8 



0737 



6644 



-24-7 



-67-8 



4183 



4207 



-32-2 



-(59-8 



3523 



3551 



Table VIII. — X Chief crystallographic axis. 



a=48-32. = 0-2988. 



<.= -£--»*. 



t v 



t-r 



e (observed). 



e (calculated). 



o 



-41 



o 



-63 



1663 



1665 



-37-5 



-66-7 



506 



503 



-379 



-666 



496 



491 



-42-3 



-722 



417 



422 



The results can be represented by the formula 



e = a(t 1 -t. 2 ) + /3(tS-t 2 2 ), 



where t x t 2 are the temperatures of the two junctions in 

 degrees centigrade, e the corresponding thermoelectric force 

 in microvolts, a and /3 were calculated by the method of 

 least squares. From the calculated values of a and /3 

 neutral temperatures should occur at — 185°*8 aud — 80 o, 9 

 respectively. 



From determinations, however, at temperatures produced 



