378 S. A. Hill — Psychromefer and Condensing Hygrometer. [No. 4, 



Series. 



No. 



Barometer. 



Factor A. 



I. 



3 



20-59 in. 



•00084 





4 



20-61 „ 



•00072 



II. 



12 



21-49 „ 



•00082 



y) 



13 



21-49 „ 



•00080 





9 



23-50 „ 



•00077 



iy 



19 



23-51 „ 



•00090 



}i 



1 



23-55 „ 



•00087 



a 



15 



25-80 „ 



•00077 



)) 



22 



29-13 „ 



•00075 



';* 



3 



29-35 „ 



•00073 



M 



4 



29-35 „ 



•00077 



The mean barometric pressure for the first six sets of observations 

 is 21*86 inches and the mean value of A is •00081. For the other five 

 the mean pressure is 27-44 inches and the mean value of the factor is 

 •00078. 



The other observatfons also indicate a substantial agreement 

 in the mean results, as will be seen from the following figures, though 

 the value of A in their case increases slightly as pressure decreases 

 owing to the preponderating influence of the relatively too numerous 

 observations made in still air at Mussoorie. 



Series. 



No. 



Barometer. 



Factor A. 



I. 



5 



22.45 in. 



•00092 



II. 



11 



23.39 „ 



•00107 



}) 



8 



23.50 „ 



•00105 



)> 



10 



23.50 „ 



•00117 





18 



23.50 „ 



•00119 





20 



23.51 „ 



•00118 



)) 



6 



23.55 „ 



•00121 





5 



23-56 „ 



•00124 



I. 



1 



23-70 „ 



•00083 



jj 



2 



24-10 „ 



•00098 



II. 



14 



25-81 „ 



•00112 



3> 



16 



27-52 „ 



•00997 





17 



27-52 „ 



•00089 



>> 



21 



29-15 „ 



•00100 



)) 



2 



29-38 „ 



•00105 



» 



1 



29-40 „ 



•00106 



Mean of first 



eight 



23-37 in. 



•00113 



Mean of last 



eight 



27-07 „ 



•00099 



If, without reference to ventilation, we combine all the observations 



