RELEASE AND RECORDER RECORD B4- 33 
the recorder record; that is, the relative-humidity portion of a contact 
will not necessarily be regarded as four-tenths of the whole contact. 
When turbulence, either on the surface or aloft, is encountered, make 
the best estimate possible by considering the length of the preceding 
and/or following contacts. Enter the values of the pressure-contacts 
immediately above the level and to the left of the temperature trace. If 
a hypsometer equipped radiosonde is used, the value of the hypsometer 
trace will be entered to the left of the temperature trace in place of the 
baroswitch value after the crossover point is reached (see JB4-13.2). 
On the surface level, enter the value of the pressure-contact at release 
as it appears on the recorder record (see JB4-6.2). The fractional value 
of the contact at release will be estimated by comparing it with the 
length of the following contact, except that when conditions of wind and 
precipitation make this impossible the most reasonable value will be 
assigned to the contact. 
12. Discrepant Contact at Release. The contact value taken from the 
calibration chart (see ¥B2-15.6) will be compared with the contact value 
at release as shown on the recorder record. 
a. If the difference between these two values is 0.2 contact or 
less, corrections will not be applied to pressure-contact val- 
ues for the significant levels. 
b. When the discrepant difference is more than 0.2 contact, but 
less than 3.0 contacts corrections to the indicated pressure- 
contact values will be determined according to the instructions 
issued for the particular series of radiosondes. If such in- 
structions are not received for the particular series of radio- 
sondes, the following instructions will be observed. If the 
release contact on the recorder record differs from the one 
determined from the calibration chart by more than 0.2 con- 
tacts, but less than 3.0 contacts, a correction will be applied 
to all levels where the aneroid pressure cellis used to deter- 
mine pressure, that correction is the difference between the 
value found on the calibration chart and the value found on the 
recorder record. This value canbe either positive or negative 
depending on whether the contact was set or jarred too high 
or too low. If, for example, the record shows that the radio- 
sonde was released with the contact point set at 5.0 and the 
calibration chart indicates that the setting should have been 
4.5, the pressure-contact at the surface level will be entered as 
5.0 - 0.5 = 4.5. In the same manner, this correction of -0.5 
contact will be applied to the pressure-contact values of all 
other significant levels. 
1-1-69 FMH#3 
