J^jj OH THE ELECTRIC COLUMN. 



view, including, with the number of the strikings of the 

 beadin a certain time and the observation of the barometer, 

 the degrees of the thermometer and of my hygrometer in the 

 room, the only place of which it could be supposed that 

 the changes of the temperature and of the degree of moisture 

 might affect the state of the column : I ehall copy here the 

 journal of these observations during the few days in which 

 the fundamental column of 600 groups still acted alone; 

 after which time I was obliged to increase the number of 

 the groups. 



April 



S. 8 



11 



1 



3 



5 



7 



11 



8 



11 



11 



11 



2 



11 



11. 7 



4 



12. 



A.M. 



P.M. 



9. 



10. 



A.M... 



P.M... 



A.M... 

 P. M. . . . 



A. M. . . 

 P.M... 



Barom. 



..29'7" 



id. .. 

 • id. .. 



id. .. 



id. .. 



id. .. 



id. .. 

 ..id. . 



id. .. 

 ..id. .. 

 ..29-8.. 

 .id. .. 



29-9 • 



..id. . 



.30 .. 



Numb, ofstrik. 

 Thermom. Hygrnm. in 10 rtiin. 



57 • 



60 . 

 6o|. 

 63 . 

 62i. 



61 ^ 

 61 . 



58 ■ 



63 . 

 61 . 

 60 . 

 58 . 

 50 . 

 56 . 



41 

 id. 

 id. 

 id. 

 id. 

 id. 

 id. 

 42 

 id. 

 41 

 id. 

 id. 

 id. 

 id. 

 id. 



.11 



.10 

 .12 

 .20 

 .10 

 . 8 



• 7 

 -11 



• 9 

 . 3 

 . 6 

 . 5 



■ 30*l..No striking the whole day, 



Cessation of 

 the striking. 



This cessation of striking having lasted two days more, 1 

 judged, that we were entering into the season, when, in 

 the two years before, the strikings of the gold leaves them- 

 selves had also ceased; so that in order to carry on the ob- 

 servations as long as possible towards the summer, it was 

 necessary to increase the number of the groups. This I 

 undertook without changing the situation of the funda- 

 mental instrument, which, on account of the necessary 

 steadiness, and of being sheltered from currents of air, was 

 to remain in the glazed box fixed against the side of the 



room. 



