216        M.  E.  Edlund's  Researches  on  the  Electromotive 
The  passage  of  the  positive  current  from  the  copper  to  the 
iron  produced  a  cooling  at  the  surface  of  union. 
Copper -Platinum, 
Exp.  12.  Intensity = tan36°45'. 
Deviations. 
31*90 
31-10 
31*50 
Exp.  11.  Intensity  =  tan  12( 
Deviations. 
9-13 
973 
1095  Mean 
Mean  .  .     9'94 
Exp.  13.  Intensity  =  tan  23°  55'. 
Deviations. 
19-38 
19-53 
Mean     .     .     19-45 
Hence  we  obtain  /3  =  0*5445;  and  from 
Exp.  11 * =47-34 
12 «=48-16 
13 a  =  46-15 
Mean     .     .     47'22 
The  electromotive  force  cf  the  copper-platinum  combination 
is  therefore  expressed  by  47*22. 
'  The  two  following  experiments  were  made  at  15-minute  in- 
tervals. 
Exp.  14.  Intensity  =  tan37°.      Exp.  15. Intensity  =tanl5°30'. 
Deviations. 
21-00 
18-43 
20-90 
20-88 
22-15 
Mean 
20-67 
Mean 
Deviations. 
7*98 
8-25 
7-80 
990 
7^2 
.  8-25 
From  these  two  experiments  we  obtain  /3y  =  0*3690,  and 
^=30*17.  The  passage  of  the  positive  current  from  the  plati- 
num to  the  copper  produced  a  cooling  at  the  surface  of  union. 
Copper-  A  luminium . 
Exp.  16.  Intensity = tan  29°52'. 
Deviations. 
18-10 
14-73 
16-20 
Mean  .  .  16*34 
Exp.  17.  Intensity  =  tan  14°  45'. 
Deviations. 
7-23 
8*05 
9-10 
Mean  .  .  8.13 
