THERMO-KLECTUTC QI'AT.ITV rXDF.H PRESST'RE. 



341 



ProAious measurements by Wagner were only to 300 kg. and from 

 0° to 100°. Of course he could not suspect the complicated actual 

 state of affairs, and comparison of our results is of little use. He 



Qo iQo 20° 30° 40° 50° 60° 70° 80° 90° 100° 



Temperature 

 0>rnmercicil Iron AnneeJed 



Figure 30. Commercial Iron, Annealed. Thermal E.M.F. of a couple 

 ■composed of one branch of uncompressed metal, the other compressed to the 

 pres.sure in kg. /cm.- indicated on the curves, the junctions being at 0°C and 

 the temperature plotted as abscissae. 



found + 12.5 X 10"'- volts per degree per kg. against + 8.3 X 10"^- 

 interpolated from the data above for annealed pure iron. His value 

 would correspond more with my value for the hard drawn specimen. 



