ON THREE BALLOON ASCENTS IN 186-1 AND 1865. 



151 



Balloon Ascent, from Woolwich Arsenal, December 1, 1864. 



mometers (free). 



Difference. 



Dew-point. 



Gridiron 

 Thermo- 

 meter. 



Dry and Wet Therms, (aspirated). 



Dry. 



Wet. 



Diff. 



Dew- 

 point. 



Hygrometers. 



Daniell's. 

 Dew-point. 



Regnault's. 

 Dew-point. 



Delicate 

 Blackened- 

 bulb Ther- 

 mometer. 



27 



3-6 

 3-8 

 4 -1 

 4'° 

 4'3 

 3 - 9 

 4'° 

 3-8 

 3"3 

 4"3 

 5*o 

 8-o 

 4-6 



5'5 

 6-o 



6-o 



6- 9 



6-5 



6- 9 



5-4 

 5 - 4 

 47 



47 

 3'9 

 37 

 4"5 

 3'i 

 4-6 



3 '9 



s-i 



4-8 

 5 - i 

 5-° 

 3"4 

 3"9 

 39 



8. 



40.4 



39" 1 



40'o 



39-6 

 396 

 38-5 

 38-9 



37'4 

 36-8 



36'3 



37-9 

 297 

 297 

 28-6 

 25 - 6 

 23-8 

 23-8 

 187 



12-5 



I2"2 

 I2"2 



156 



i's-6 



ai - 3 



2I"9 



224 



22"0 

 166 



i6-s 



9' 1 

 9-8 

 89 

 8-9 

 9-6 

 9-1 

 91 



46-5 



468 

 48-0 

 482 



48-0 



38-5 



35 - ° 



9. 



10. 



11. 



12. 



13. 



14. 



General Remarks. 



40'2 



40*0 

 40'o 



[dew 

 iyo no 



[dew 

 15-0 no 



40 - o 



[dew 

 16-0 no 



[dew 

 19-0 no 



15. 



16. 



56-0 

 56-0 



47 ° 

 44 - 5 



40'o 



390 

 35"S 



33'° 



29-5 



3i-5 

 31-0 

 30-0 



17. 



(13) Ozone =0. (14) Wind N.N.W. 



(15) Nearly opposite Erith ; hills and dales distinctly visible. 



(16) Sun-spectrum very fine. (17) Sand out. 



(18) A little to the right, or nearly over Dartford. 



(19) Moving towards Cobham Park. 



(20) Cannot get any dew on either Daniell or Regnault. 



(21) No ozone. 



(22) South of Greenhithe ; smoke near the earth moving S., but after reaching 1000 feet 

 moving N. 



(23) In a line with Northfleet ; we shall pass over Cobham Park. 



