PRESSURE 



55 



entered at the top of column 13 and enter the corrected reading in columns 

 14-15, "Barometer corrected." 



6411. The pressure is entered in column 15, "Barometer corrected 

 (mb.)," in "tens," "units," and "tenths" of millibars, and the initial "9" or 

 "10" in column 14. If the barometer reading is in inches, use Code Table 8 

 to convert the value to millibars. If the reading is in millimeters, use 

 Table 29A (in the back of this manual). Example: A pressure of 981.7 milli- 

 bars is entered in column 15 (PPP) as 817, and in column 14 as 9. 



CODE TABLE 8 



Symbol PPP. — Corrected barometer reading 

 Code in "tens," "units," and tenths of millibars, omit initial 9 or 10] 

 1 inch = 33.86395 mb. 1 mb, = 0.02952993 inch] 



664508 O - 62 ■ 



