TRANSACTIONS OF THE SECTIONS. 



35 



T.VBLE (confintied). 



(1) Overcast; wind W.S.W., with light pres.sure on the ground, but very strong on 

 leaving the earth, and caused a great strain on the rope, so great indeed that the observa- 

 tions were not repeated. 



On July 23rd, 18G9, with a cloudy sky, nine siiccessire series of experimenlg 

 were made betvi'een the hours of 3 p.m. and T.-iO r.jr. 



The temperature of the air on the sjronnd at the first series was 7.j°'0, and at 

 the last 09° -8, showing a decrease of 3° -8. 



The temperature of the air at 1000 ft. high at the first series was GG°'8, and at 

 the last Go°. 



The temperature of the air at 1000 ft. was therefore (f-5 and 4°-8 lower than on 

 the ground respectively at these two times. 



On the ground the temperature declined 3°'8, whilst at the height of 1000 ft. 

 the decline was 1°'8, or less than one-half that on the gi'ound. 



On July 24th, 1869, with a clear sk}', a similar set of experiments were made 

 within the same hours, \iz., 3 p.m. to 7.30 p.m. 



The temperature of the air on the ground at the first series was 7G°"2j and at 

 the last was 70'^ '9. 



The temperature of the air at the height of 1000 ft. was G8°'8 at the fir.'st, and 

 67°'9 at the last series; it was therefore lower by 7°'4 at the first, and by 3" at 

 the last series, than on the ground ; the decline of temperature on the g-round was 

 C°'3, whilst that at 1000 ft. high was 0°-9. 



Of the 3*^ less temperature at 1000 ft. high at the last expen'ment, 1° took plr.ee 



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