1858.] Meteorological Observations on Parisnath Hill. 29 



Moisture. — Observations of the moisture on the hill had been 

 made on the 2nd for the hours 9 h. 15 m., 10 h. 15 m., 5 and 6, and 

 on the 3rd for the hours 9, 10, 2, 3, 4, 5, 6. The observations, and 

 the tensions of moisture, computed for the hill and for Calcutta by 

 August's formula, are given in the following table. The column 

 headed with t gives the reading of the dry bulb, t — t' the difference 

 between the dry and wet bulb. The last column contains, only for 

 the 3rd April, the means between the tensions at Calcutta and on 

 the hill. 





Table VIII. 



— Tension of Moisture 







Time. 





Tempi 





Calcutta. 



Mean 

















2nd April. 



t 



t — t' 



Tension. 

 Inches. 



t 



t — t' 



Tension. 

 Inches. 



Tension. 

 Inches. 



9h. 15m. a.m. 



23.3 



96 



0.238 



30 1 



4.3 



0.856 





10 h. 15 m. „ 



237 



9.3 



0.264 



31.8 



53 



0.86.9 





4h.55m. p. m. 



26.9 



10.5 



0.311 



35.6 



10.8 



0.609 





6 



25.5 



10.4 



0.262 



33.3 



8.9 



0.655 





3rd April. 

















9 A.M. 



24.2 



10.2 



0.203 



30.1 



3.3 



0.941 



0.572 



10 h. 10 m. 



25.2 



10.0 



0/242 



31.9 



4.2 



0.972 



0.607 



2 P. M. 



30.3 



12 9 



0.283 



36.1 



7.8 



0.913 



0.598 



3 „ 



30.1 



13.7 



0.230 



36.3 



8.0 



0.909 



0.569 



4 „ 



30.0 



13.2 



0.255 



36.0 



6.6 



1.020 



0.637 



5 „ 



28.1 



12.9 



0.209 



34 7 



52 



1065 



0.637 



6 „ 



26.7 



11.9 



0.219 



32.3 



3.8 



1.045 



0.632 



The regular course, which the tension of vapour during the dry 

 months follows at Calcutta, is this : the tension is at a minimum 

 between 5 and 7 a. m. or about sunrise, and attains a maximum at 

 9 or 10. It comes to a second minimum between 1 and 4 p. m. and 

 reaches a second maximum between 6 and 8 in the evening. About 

 this maximum the tension either oscillates for some hours or it 

 begins at once to decrease again till sunrise. Figs. 9 and 10. 



A general coincidence with this course can be traced in the few 

 observations at Calcutta, on the 3rd, which are here recorded. The 

 figure 7 in the plate gives the curve more complete. 



