Bl1-4 INSPECTING AND TESTING THE RADIOSONDE 
a. If the contact value falls on a whole contact (5.0, 10.0, 13.0, 
etc.), use the pressure value corresponding to that contact. 
b. If the contact value falls between two whole contacts (5.2, 10.1, 
13.7, etc.), use the method of linear interpolation. 
(1) Subtract the value of pressure corresponding to the higher 
contact from the corresponding pressure at the lower 
contact. 
(2) Multiply the result obtained in step (1) by the tenths value 
of the pressure contact. 
(3) Subtract the product obtained in step (2) from the pres- 
sure value atthe lower contact. The resultis the pressure 
at the desired contact. 
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Figure B1-3. Portion of Digital Calibration Chart 
Lal 69 FMH#3 
