RELEASE AND RECORDER RECORD B4-35 
c. Draw a straight line connecting the hypsometer traces. Ifa 
trace has a correction dot, draw to the dot. 
d. If the sounding terminates on a temperature or reference 
trace, extend the hypsometer trend line to the terminating 
level. 
e. The hypsometer ordinate for significant levels will be read 
from this constructed curve. 
13.1 Evaluation of Hypsometer Data. During the flight no indication of 
the hypsometer trace will appear on the recorder record until the hu- 
midity circuit has terminated. Pressure values will be taken from the 
baroswitch traces from the release to the level in which hypsometer 
traces become usable. Criteria for using the hypsometer trace are as 
follows: 
a. Beginning at an altitude where the pressure is close to or 
slightly less than 50 mb (or 100 mbwhen calibrated from 100 
mb) compare the values indicated by the baroswitch and the 
hypsometer at successive portions of the hypsometer trace. 
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1-1-69 FMH#3 
