Notes on meteorological observations at Plymouth. 1'73 



Atmospheric Pressure, 



The mean pressures, reduced to 32° F. and sea level (for the 

 twenty-six years, 1865 — 1890), are as follows : 



Means 



29-957 



1-076 „ 



The maximum pressure thus occurs in June, and the minimum in 

 October and November. The month of greatest range is January ; 

 that of least, August. The highest recorded reading, 80'952 inches, 

 occurs in January, 1882 ; and the lowest, 28*418 inches, in December, 

 1876. The highest monthly mean, 30"347 inches, is that for January, 

 1880; and the lowest, 29-422 inches that for December, 1876. It 

 should be noted that for the reductions to sea level the tables supplied 

 by the Meteorological Office have been employed. 



For purposes of comparison I have taken the means for the 

 fifteen years, 1870 — 1884, and beside these are placed means for the 

 same years from Falmouth Observatory, the last named being ex- 

 tracted from the " Challenger " Report on Atmospheric Circulation,"'^ 

 and reduced to sea level by means of the table given in ' Instructions 

 in the Use of Meteorological Instruments,^ issued by the Meteoro- 

 logical Office. 



