338 Mr. L. Lownds on the Thermomagnetic and 



The following points may be noted : — 



1. The transversal effect is smaller when the current ot 

 heat is parallel to the crystallography axis than when it is at 

 right angles. 



Fisr. 6. 



2. In the first case negative values are obtained at a mean 

 temperature o£ 73° C, similar to those found by v. Ever- 

 dingen and Yamaguchi for electrolytic bismuth. 



3. Whereas Yamaguchi found the transversal effect for 

 electrolytic bismuth to increase continuously as the tempe- 

 rature sank, I find for crystalline bismuth for low tempera- 

 tures and large field-strengths a diminution of the effect. 



§ 7. The Thermoelectric Force. — The potential-difference 

 between the two coppers D and E (fig. 3) gives the thermo- 

 electric force for copper-bismuth for a temperature-difference 

 shown by the iron-constantan thermo-elements d and dl. 

 These temperatures were determined before and after the 

 measurement of the electromotive force, the difference of 

 temperature being produced in exactly the same way as 

 described in § 4. 



