XHE AURORA BOREALIS. 



747 



In the month of January 1873 other results appeared. The 

 experiments are given in the order in Tvhich they were made, 

 and afterwards follow remarks on the meteorological conditions, 

 as well as the temperature, which gives the best indication of the 

 changes of weather. 



The connexion between the electricity of the air and the 

 weather will appear from the meteorological observations : — 





Hour. 



Charge from 



Temp. 





Date. 









Remarks. 







Air. 



Ground. 



Bat- 

 tery. 







Jan. 21 



h. 

 9 



+ 0-5 



-0-5 



11 





 - 5 



The deviation instantly ceased. 



„ 22 



11 



+5 



-0-5 



22 



+ 3 



Heavy storm from S.S.W. to S. 



„ 22 



21 









— 







C Both ground and air are electrified posi- 

 l tively. Deviation small. 



„ 23 



10 



— 



— 



— 







Feb. 6 



11 



+7 



— 



11 



- 1 





» 1 



10-111 



+ 0-6 



-0-5 





-15 



Good insulation. The lamp gave the 

 electricity of Air +5. 



« 10 



18 



+ 12 



— 



— 



-26 



After strong N.W. wind. 



» 19 



17 



C+8 



-18") 



— 



-32 



Good insulation. Great disturbance, so 

 as to prevent measurement. 











„ 20 



16 



< +11 

 C + 15 



-20 ■ 

 -25; 



7 to 8 



-38 



Good insulation. 



» 21 



10 



C+12 

 1+14 



-70) 

 -80 i 



7 to 8 



-31 





» 25 



18 



(■+20 

 1+18 



r+10 

 1+13 





8 to 9 



-83 



("The long pole was employed for the first 



l time for raising the Collector. 



rOnce the lamp gave -12 for Air, after 



» 26 



14 



5 



-31 



< having been raised for some time. 











C Clear, except to the west. 



„ 27 



10 



r+25") 



l+30) 



5-+15 



-35 



6 to 8 



-33 



Almost clear. 



» 27 



13 



-25) 

 -20 j 



7 to 8 



—34 



("Strong mirage to the west. Clear sky, 

 X with stratus to west and south. 



1+17 









(■-9 

 1-16 



-41) 

 -38 j 







r Repeated experiments. A slight mist 



„ 27 



21 



7 



-32 



I began to rise in the south, whicli an 











C hour later covered the whole sky. 



„ 28 



9 



.(--8 

 1-10 



-16) 

 ~20J 



8 to 9 



-27 



("Insulation not so good. Light veil of 

 I clouds. A few snow flakes. 



„ 28 



14 



r-io 



1-13 



-38) 

 -35) 



8 



-28 



(Clear except to the East. Scattered 

 C nimbus clouds. 



„ 28 



21 



[i^; 



-51) 

 -53 j 



7 to 8 



-33 



Entirely clear. 



Mar. 1 



10 



{=2^5 



-10) 

 -13 f 



5 to 6 



-33 



Clear. Very little wind from E.S.E. 



» 1 



16 



-16) 

 -17] 



6 to 7 



-31 



(■Wind N.E. Sky cloudy to N.E.,N.,and 

 C W., with nimbus and stratus. 



,. 1 



22 



(=3 



-}} 



9 to 10 



-19 



Cloudy. 



» 2 



10 







6 to 7 



- 7 



Charge from battery instantly falls to 

 zero. 



„ 10 



14 



(-+22 

 1+24 



-25) 

 -30 i 



7 to 9 



-16 



Good insulation. 



„ 20 



14 



{-I 



-35) 

 -40) 



7 to 9 



-33 





„ 20 



21 



- 3 



-45 



6 to 7 



-32 





,, 21 



11 



- 5 



-40 



9 



-32 



Needles of ice floating in the air. 



„ 21 



15 



- 8 



-38 



8 



-31 





» 21 



21 



-10 



-45 



— 



-32 



Wind tolerably strong from the N.W. 



„ 22 



10 



-15 



-18 



8 to 9 



-27 



Needles of ice in the air. 



„ 23 



10 



- 3 



-16 



7 



-32 



Pretty clear. Needles of ice. Almost 

 calm. Some cirro-stratus. 



„ 23 



14 



f+lO) 

 1+19J 



-30 



- 



-33 



Almost clear. Fog over the sea. 



» 24 



10 



(- 9-) 



1- e; 



-29 



7 



-32 



Do. Cirro-stratus to S.W. 



