406 



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



sulphur vapour. Each limb was calibrated separately, but 

 they were found to be similar. The part of the calibration 

 curve from 288° C. to 430° C. was plotted from the 

 equation : — 



E.M.F. (in volts) x 10 8 = 0'1407 * + 0-001227 iK 



Bl " 





- . ' 





\ 









\ 





• 



x '4 







■ i 



B.M.F., Volts x 10 s 



This equation was obtained from the point on the curve 

 determined with sulphur, and the point where £ = 220 o, 7 C. 

 on the curve as drawn in between 0° C. and 288° C. By the 

 application of the method of least squares to all the calibra- 



