B4- 42 RELEASE AND RECORDER RECORD 
b. Read the relative humidity ordinate values to the nearest one- 
tenth, and enter them immediately to the right of the tempera- 
ture trace and below the levels. These values, their recorder 
and drift corrections, and the corrected values willbe enclosed 
in parentheses. Enter ''M"' if a valueis classified as missing. 
16. Application of Corrections to Temperature, Relative Humidity and 
Hypsometer., 
16.1 Recorder Correction. Enter the applicable recorder corrections, 
with proper sign prefixed, to the right of the temperature, relative-hu- 
midity, and hypsometer ordinate values. Zero corrections will not be 
entered, 
16.1.1 Recorder-Correction Changes. When a new setof recorder cor- 
rections is issued by an electronics technician, anote will be entered to 
that effect on the first fold of the first recorder record obtained after 
the calibration, and a list of the recorder corrections will also be en- 
tered. The note should indicate whether the corrections are ''Temporary" 
or "Final", A note shouldbe enteredonthe recorder record for the first 
flight after each calibration showing that the recorder has been recali- 
brated, even though there is no change in the calibration. If no correc- 
tions are required, then the note should so state. 
16.2 Drift and Shift Corrections. Corrections for shifts will be applied 
as though the shift had been a drift. 
16.2.1 Drift Corrections. Drift corrections will be based on ordinate 
values after recorder corrections have been applied. The ordinate dif- 
ference between the drift line and the ninety-fifth ordinate, at the point 
where each significant levelintersects it, willbe placed with proper sign 
prefixed, immediately to the left of the drift line and on the significant 
level. 
16.2.2 Computation of Drift Corrections. Multiply the temperature, hu- 
midity, and hypsometer ordinate values (after application of recorder 
corrections) by the drift. Divide the product by the ordinate value of the 
low-reference drift line. The quotient is the drift correction. To correct 
humidity and temperature ordinate values at significant levels, place the 
quotient with the proper sign prefixed, immediately after the recorder 
correction applied to the ordinate values (zerodrift corrections will not 
be applied). This will be followed by an equal (=) sign and the corrected 
ordinate, thus: 30.0 - 0.1 + 0.2 =30.1, where the recorder correction is 
-0.1 and the drift correction is +0.2. 
1-1-69 FMH#3 
