PREPARATION OF CHARTS Bo=31 
Given: Station Altitude 60 feet 
(1) 
(2) 
(3) 
(4) 
Station Pressure 1025 mb 
Freezing level occurs at the 25th contact 
The calibration chart furnished with the radiosonde indi- 
cated that the 25th contact corresponds to a pressure of 
740 mb. 
From Table 16 it is found that a pressure of 740 mb 
corresponds to an altitude of 8400 feet mean sea level (to 
the nearest hundred feet). 
In a similar manner, it is found thatthe station pressure 
of 1025 mb corresponds to an altitude of -300 feet mean 
sea level (to the nearest hundred feet). 
Subtract algebraically the value found in (3) from that 
found in (2): 8400 - (-300) = 8700 
Plus station altitude of 60 feet (to the nearest hundred 
feet = 100 
Required altitude 8800 feet 
It will be noted that the value found in (3) will always be 
negative for pressures of 1016 mb or greater. 
16. Mailing of Forms. 
16.1 General. The flight records and computation forms will be assem- 
bled and mailed in accordance with instructions issued by the separate 
services. 
1-1-69 
FMH#3 
