1858.] Meteorological Observations on JParisnath Hill. 



31 



Assuming that the mean tensions in table VIII. each being the 

 mean between a higher tension, at Calcutta, and a lower one on the 

 hill, were on an average about 0.04 inches too high, the negative 

 character of the error in the computed values of S, and its quantity, 

 are at once explained. 



The close correspondence, taking the moisture into account, of 

 the computed values of S with the observed barometrical differences, 

 allows a conclusion, that the quantities H., t and b, employed in 

 their calculation could not have differed materially from their true 

 values.* 



It also assures us of the complete control we may, with good 

 observations and a favorable state of the atmosphere, exert over the 

 changes in the specific gravity of a stratum of air between two 

 stations, appropriately situated, and their causes. The advantage of 

 such a control, if its general applicability be once fairly established, 

 as a means of testing and correcting meteorological observations of 

 all kinds, is obvious. 



I am well aware that conclusions, drawn from so small a num- 

 ber of observations, as in the present instance at my disposal, and 

 results based upon quantities, which themselves require verification 

 have no claim to generality before they have been repeatedly con- 

 firmed. It is possible, if the height of the temple had been determined 

 by better methods, than 1 could use, and if the determination of 

 moisture had been more accurate than the method employed will 



* As it may be of interest to know the influence which an alteration in the 

 value of p would have upon the value of S, I give the results of table IX. as 

 obtained if the old values of the specific gravity of mercury (13.598) and of air 

 (0.0012991) are employed, which would make p = 10467.24. 



Time. 



S. 



S. 



Deviation or 





Observed. 



Calculated. 



error. 



9 A. M. 



3.876 



3.899 



0.023 



10h. 10m. 



3.873 



3.894 



0.021 



2 



3.837 



3.861 



0.024 



3 



3.839 



3.363 



0.024 



4 



3.843 



3.863 



0.020 



5 



3.84 b 



3.865 



0.021 



6 



3.846 



3.867 



0.021 



Average, . . 



•• 





0.022 



