Atmospheric Electricity. 



457 



certain meteorological conditions, similar readings may always 

 be expected. 



The following table gives the electrometer-readings at 10 a.m., 

 along with the observations of wind-direction, moisture, and 

 rainfall made at the same hour at the Madras observatory. 



Table I. 

 Observations at 10 hours M.M.T. 



September 1883. 





Electro- 



Percentage 



Wind- 



Rain in 







Date. 



meter- 

 readings. 



of satura- 

 tion. 



direction. 



past 24 

 hours. 



Remarks. 













inch. 







1. 





56 



W. 



0*01 







2. 





57 



w.s.w. 



001 







3. 





47 



w. 









4! 



-241 ' 



55 



w. 









5. 



^ 93 



44 



w. 









6. 



-310 



55 



w.s.w. 









7. 



+ 16 



64 



s.w. 



003 



Cloudy and cool. 





8. 



- 6 



46 



w.s.w. 





Rain at 7 p.m. 





9. 



4- 16 



53 



w.s.w. 



003 



Morning cool and cloudy. 





10. 



- 21 



61 



w.s.w. 









11. 



- 13 



55 



W.N.W. 





Cloudy, but hot. 





12. 



- 70 



49 



w. 





Thin haze ; much dust. 













f 



Distant lightning in early morn- 



13. 



+ 18 



53 



w. 



{ 



ing. Local showers in 

 afternoon. 



the 



14. 



- 11 



56 



w.s.w. 









15. 



? 



49 



W.N.W. 









16. 



? 



55 



W.N.W. 









17. 



? 



73 



s.s.w. 









18. 



+ 



69 



w.s.w. 









19. 



? 



50 



w. 









20. 



- 34 



44 



N.W. 









21. 



- 19 



49 



w. 









22. 



- 4 



51 



w. 









23. 



? 



52 



W.N.W. 









24. 



- 25 



62 



W.N.W. 





Bright. 





] 25. 



- 15 



57 



W.N.W. 





Cloudy. 





| 26. 



+ 6 



63 



N.N.W. 





Dull and hazy. 





i 27. 



+ 5 



59 



S.E. 









28. 



+ 



56 



S.W. 



0-04 







1 29. 



? 



58 



w.s.w. 









30. 



? 



72 



W.N.W. 



0-45 







Note. — Column 2 gives the difference between the earth- 

 readings and air-readings in divisions of the scale, of which 

 about 24=110 volts. 



Neglecting cases occurring in broken weather, the next 

 negative readings were got in March 1884. During that 

 month negative readings were obtained on six days, and on 

 each occasion the weather was bright and the wind south- 

 westerly; and no rain fell in Madras on these days, nor, in 



