286 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Copper- German-silver Junctions. 



August 31, 1895, further observations were made on No. 2 at 25°. 4 

 and at 59°. 2, but they were comparative only, as the reduction factor 

 of the galvanometer was not determined on this day. If we assume 

 the effect at 25°. 4 to have been the same as on August 29, we get 



o 



No. 2 August 31 25.4 1746 



" " 59.2 1951 



It is found by interpolation that No. 1 would give for 



The differences between the results obtained with the two pairs of 

 junctions are probably within the limits of e.\;perimental error, and it 

 appears better to use the results from both pairs in plotting the cali- 

 bration curve than to use those from No. 2 only. No great accuracy 

 is claimed for the absolute values obtained in any of the calibration 

 tests. The calibration curve of No. 1 is shown as No. 1 in Figure 8. 

 It is very slightly convex upward. The observations of August 31, 

 reduced to absolute measure by means of the assumption already 

 stated, are used, with those of August 29, to give data for the calibra- 

 tion curve of No. 2. This curve, No. 2 of Figure 8, is very slightly 



