30 PROCEEDINGS OF THE AMERICAN ACADEMY. 



Time. 



10: 52 Observations with couples MM 1 and P P' opposed. 



L L' " 0' 

 " " '• KJO « NN' 



L V " 0' 

 11:22 " « « J/ J/' " Pi 3 ' " 



Measurement of main current. 

 " " disturbing effects. 



11:35 " " sensitiveness. 



" " main current. 



11 : 45 Observations with couples MM' and P P' opposed. 

 " " L V " 0' 



u XK< « NN' 

 " " " i/7 " 0' 



P.M., 12:18 " '• " J/i)/' " PP' 



Measurement of main current. 

 " " disturbing effects. 



12:35 " " sensitiveness. 



" " main current. 



12: 54 Observations with couples AIM' and P P' opposed. 



LTJ " 0' 



KK> " NN' 



L V " 0' 



1:30 " « " MM'" PP' 



Measurement of main current. 



1 : 36 Reversal " '• " to condition B. 



Measurement of disturbing effects. 

 1:45 " " sensitiveness. 



Wait for effects of reversal to occur. 



2 : 2G Measurement of sensitiveness. 



" " disturbing effects. 



" " main current. « 



2:42 Observations with couples MM' and P P' opposed. 

 " " L U " O 0' 



And so on till the observations made with main currrcnt 

 in condition B correspond in number and variety to 

 5 : 50 those made with current in condition F. 



Throughout the day various incidental observations, of 

 the barometer, the temperature of the galvanometer, 

 etc., were occasionally made. 



