PREPARATION OF CHARTS B5-17 
8.3 Tables 10 and 12. The pressure and temperature arguments used 
in deriving values from these tables are those entered on lines 1 and 6 
respectively. The arguments in the tables nearest to the corresponding 
values of pressure and temperature entered on lines 1 and 6 will be 
used. Interpolation is not necessary; therefore, the entry on line 7 will 
always be to the nearest whole degree. 
8.4 Tables _ 11 and 13. The temperature argument used in deriving 
values from these tables is that entered online 8 pertaining to the level 
whose altitude is being sought. The pressure argument is the value 
entered on line 1, rounded to the next lower multiple of 10 millibars. 
For example, if the pressure is 978.9, for purposes of Table 11 it will 
be regarded as 970. Interpolation for the remainder, 8.9 will be made in 
table 14. With the rounded value of pressure and the temperature value 
taken from line 8 as arguments, find the corresponding tabular value 
in table 11 or 13 and enteriton line 10. The immediately adjacent value 
in the column captioned "dif'' to the right of this tabular value will be 
entered on line 11. 
8.5 Table 14, Thisisatable of proportional parts designed to facilitate 
interpolation of altitude differences found intables 11 and 13 for various 
values. One argument is the difference in pressure between the value 
entered on line 1 and the next lower multiple of 10 millibars. The other 
argument is the altitude difference ''dif'' value entered on line 11 and 
referred to in §B5-8.4. The value taken from Table 14 corresponding to 
these arguments will be entered on line 12. 
8.6 Maximum Altitude. Find the thickness of the stratum between the 
highest standard isobaric surface and the level atthe maximum altitude 
of the raob (whenever this level does not coincide with a standard iso- 
baric surface) in accordarce with the instructions inthe following para- 
graphs. Computations will be made within the last 10° space on the right 
side of the adiabatic chart. 
a. From Table 8, find the uncorrected thickness ofthis stratum, 
using as the sole argument the pressure at the maximum alti- 
tude of the raob. Enter the value from Table 8 about 1 inch 
above the terminating level. 
b. By use of Table 9, the thickness found in (a) will be corrected 
for temperature in the same manner as the corresponding 
thickness in the stratum bounded by the surface and the next 
higher standard isobar. The arguments are the mean virtual 
temperature and the uncorrected thickness of the stratum. 
oi {58 F MH#3 
