Al-2 RAWINSONDE SYSTEMS 
2. Components Differing From the Basic Rawinsonde System. The 
following is a brief description of components differing from the basic 
rawinsonde system. 
2.1 Hypsometer. The hypsometer-radiosonde is similar to that used in 
the basic system except that a more accurate pressure measurement de- 
vice, a hypsometer, is included inthe radiosonde. The hypsometer mea- 
sures pressure at high altitude by employing the relationship between 
the temperature of the ebullient fluid and the atmospheric pressure. A 
small thermistor bead is used to measure the temperature of the ebul- 
lient fluid. Height data computations using the hypsometer are begun at 
some point of pressure less than 100 mb, 
bohe 
Figure Al - 2. GMD-1{ ), Tracking Unit 
> lo OY) F MH#3 
