METEOROLOGICAL TABLES. 



25b 



Table 15 M. Temperature correction to be added to the virtual temperature at the earth's surface in 

 order to give the most probable average virtual temperature in the sheet between the earth's sur- 

 face and the nearest standard isobaric surfaces {based upon statistics). 



Extrapolation beloiv the earth's surface common for all pressures and seasons. 



Example. Low pressure, autumn, at the station pressure 984.3 m-bars, virtual temperature 9.4 . 



Column 1. Standard surfaces. 



2. Approximate height of these surfaces, found from table 11 m for the pressure of 984.3 m-bars 



at the station. 



3. Temperature corrections according to table 15 m for low pressure, autumn, and for the heights 



of column 2. 



4. Most probable average virtual temperature of the sheets between the earth and the standard sur- 



faces of column 1, found by addition of the corrections of column 3 to the virtual tem- 

 perature at the station 9-4. 



5. Corrections to the heights of column 2, found from table 12 M for the heights of column 2 



and the average virtual temperatures of column 4. 



6. Heights of the standard surfaces above the station, found by addition of the approximate heights 



of column 2 and the corrections of column 5. 



