Al-4 RAWINSONDE SYSTEMS 
3. Orientation of Ground Equipment, The Federal Meteorological 
Handbook No. 5 (Winds- Aloft Observations) provides instructions for 
orientation of the ground equipment. 
4. Separate Instructions, Detailed instructions for reports, receiving 
and recording equipment, radiosondes, supplies, test equipment, evalu- 
ation equipment, special flights, checking of observations, mailing of 
forms etc., are contained in separate instructions issued by each service. 
NOTE: Separate instructions, detailed instructions etc. mentioned in all 
chapters refer to instructions containedin Part Cissued by the separate 
services, 
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