71 



METEOROLOGICAL OBSERVATIONS. 



A systematic course of Meteorological observations was begun in the 

 month of July, a summary of the records of which is herewith 

 appended. 



OBSERVATORY. 



Latitude 40 41 North. 



Longitude 73 57 West. 



Height of ground above the sea 117 feet. 



Height of instrument above the ground 20 " 



Height of instrument above the sea 137 " 



METEOROLOGICAL TABLE, No. 1. 



Table showing the observed heights of the Barometer, monthly, for the half 

 year ending December 31st, 1868. 



Month, 



1868. 



Mean at 

 7 A. M. 



Mean at 

 2 P. M. 



Mean at 

 9 P. M. 



Month 

 Mean. 



Maxi- 

 mum. 



Mini- 

 mum. 



Diffr'nce 



or 

 Range. 



July 



30.018 

 30.050 

 30.056 

 30.029 

 29.937 

 29.887 



30.013 

 30.049 

 30.043 

 30.099 



29.881 

 29.909 



30.012 

 30.045 

 30.038 

 30 049 

 29.970 

 29.949 



30.014 

 30.048 

 30.046 

 30.059 

 29.929 

 29.915 



30.200 

 30.280 

 30.350 

 30.490 

 30.400 

 30.700 



29.730 

 29.740 

 29.840 

 29.700 

 29.160 

 28.900 



0.470 





0.540 





0.510 

 0.790 



November. ..... 



1.240 

 1.800 



Semi-year mean, at 7 A. M. of 184 observations, 29.996 

 Semi year mean, at 2 P. M. of 184 observations, 29.999 

 Semi year mean, at 9 P. M. of 184 observations, 30.011 



Semi-year mean of 552 observations, 30.002 



Maximum for the half year 30.700 at 7 A.M. Dec. 26. 



Minimum for the half year 28.900 at 7 A. M. Dec. 12. 



Difference or range 1 . 800 



