310 



BRIDGMAN. 



cations of 12000 kg. at room temperature. The point at 4000 with 

 this agreed with the point found with the other wire before it broke. 

 After the run at 95° with the new piece, another run with the new 

 piece was made at 63°. This fitted smoothly between the two runs 



Temperature 



Pure Alumipum 



Figure 14. "Pure" Aluminum. Thermal E.M.F. of a couple composed 

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

 pressure indicated on the curves, the junctions being at 0°C and the tempera- 

 ture plotted as abscissae. 



with the first specimen, so that we may be confident that no error 

 was introduced by changing pieces. 



The experimental points with the purer aluminum lie smoothly. 

 The maximum zero correction was 1.5% of the maximum effect, the 

 maximum departure of any point from a smooth curve was 2% of 



