Bs-4 PREPARATION OF CHARTS 
2 Names of Computer and Verifier. Print clearly the initials and 
surname, and military rank or rating, if any, of the computer and veri- 
fier on all WBAN-31( )and recorder records. The forms will be verified 
by an observer other than the computer, insofar as possible. 
3. Data Block. A data block is printed on each of the three adiabatic 
charts, Enter only data in each block that pertain to the corresponding 
adiabatic chart. However, data pertaining to the levels common to WBAN- 
31A and B will be entered only in''Data Block A,'' and levels common to 
WBAN-31B and C willbe entered only in ''Data Block B." In the following 
instructions, surface pressure and surface altitude refer tothe value of 
these data at the point determined in JB4-4.3. 
3.1 Significant Levels. When the number of significant levels on 
WBAN-31( ) exceeds the number of available significant level blocks on 
that chart, divide a sufficient number ofthe blocks in half to provide for 
the extra levels. Care must be taken to insure that all entries in these 
blocks are legible. 
3.2 Data to be Entered in Data Blocks. Appropriate surface data at 
release will be entered on the first line of Data Block A. The pressure 
contact or hypsometer ordinate, temperature ordinate, and relative hu- 
midity ordinate for each upper level evaluated on the recorder record 
will be entered opposite its corresponding level number. The surface is 
the first significant level. In the case of multiple ascents (see JB4-6.6 
(a)), the significant level blocks will be dividedin half and the last level 
of the first ascent will be entered in the top half and the first level of 
the last ascent will be entered in the bottom half, both will have the same 
level number. When a requirement for one or more additional levels is 
found after successive levels have already been entered in the Data 
Block, the new levels may be entered near the bottom of the Data Block 
and assigned subfigures (2A, 4A, 4B, etc.) toindicate their proper order 
among the levels already evaluated. 
Level numbers pertaining to the first level entered on the first hori- 
zontal line of Data Block B will be numbered one higher than the last 
level entered in Data Block A. 
Succeeding levels will be entered in Data Block B and numbered con- 
secutively. Whenever the sounding extends to a pressure lower than 100 
millibars, follow the same procedure when entering data in Data Block C. 
3.2.1 Missing and Doubtful Data. Whenever a level is placed on a re- 
corder record to indicate missing data, ''Missing Data'' will be entered in 
the data block at approximately the middle of the line corresponding to 
= = (O89) F MH#3 
