ON THE ELECTRIC COLUMN. 



169 



moment; for the addition of 300 of the small groups ought 

 to have produced with the whole only 8|- sinkings in 5 

 minutes, and there were 10. 



From this increase of power, I expected a greater dura- 

 tion of observations in this season ; but I soon saw a dimi- T>miinution of 

 nution in the frequency of the strikings, whi^^h disappointed ^ ^ " '"^* 

 me. I lost again much time in changing ihe arrangement 

 of the apparatus, in order to take in al o the two coivmns 

 formed of tinned-iron plates, mentioned in my first paper : 

 there were 70O of these groups, which produced in the 

 gold-leaves, nearly the same divergence as the column of 300 

 zinc plates 1 1 inch square : This being the only change that 

 I could undertake for the season, I began another course of 

 observations; and it will be seen in the following journal, went on 

 how rapidly the effect went on diminishing. 



rapidly. 



Barom. 



May 

 10. 



Thermom. Ilygiom. 



Nvmh ofstril. 

 in 5 min. 



11. 



8 A.M.. 



12 



2 P.M.. 



.63 

 •67 

 .67 



30-25 65 



■.30'15. 



id. .. 



•30-17.' 



30'20.. 



A.M. 



P.M. 



A.M.. 



id. ... 



. id. . . 



id. .. 



id. .». 



id. ... 



id. ... 

 .30-19. • 



..65 

 ..59 

 ..64 

 .67 



.67 

 .64 

 ■•57 



.1 30-18 60 



13. 



14. 



3 



10 



9 



1 



10 



9 

 12 



3 

 11 



P.M.. 



A.M.. 

 P.M.. 



A.M.. 



P.M.. 



•30-15- 



30-10.. 

 .30-05. 

 '30-02.. 



30 .. 

 .29'85. 



29-80.. 

 . id, . 



29.7.5' 



.65^. 



• 65^ 

 .63 . 

 .Q5 ' 



• 64 . 

 .62 . 

 .65 . 

 -67 '. 



• 66 . 



.40 . 

 •id. . 

 .id. . 



• id. . 

 •id. . 

 •id. . 



..41 . 

 ■-39i- 



• id. . 

 .id. . 

 .39 . 

 -39^. 

 .39 . 



■.38i. 



•39 . 

 ..40 . 



•39i-. 



•39i-- 

 •.39^. 



• id. . 



• id. . 

 .39 



14 

 19 

 17 

 16 

 12 

 10 



7 



8 

 11 



9 



4 



4 



4 



6 



44- 



"* 



7 



2 



5 



7 



8 



. no striking. 

 1 5. 



