400 



Mr. W. B. Burnie on the Thermo-electric 



As the temperatures to be measured approached the neutral 

 point of the therm o-element used in the last experiments, an 

 iron-constantan thermo-element was employed to measure 



Fig. 1. — Copper-Lead Thermo-element. 



125 



10€ 



C 

 s* 



Pi 



75 



25 









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i 

 1 f\ 









f 



/ 







, - '■'■■' ' . ■ ■ . 



J 





1 ■ . ■ 

 ! 





■'/ 



/ 



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- 





X 



O 



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After rjnid: cool 

 After % slcrr cpcUn 



\ 

 in j 



o 











j 



1 



Temperature C. 



the temperature-differences between the two junctions. This 

 thermo-element was calibrated by the observation of the gal- 

 vanometer deflexions when one junction was in melting ice 



