46 INSTRUCTIONS T(3 MARINE METEOROLOGICAL OBSERVERS 



below if the scale of his barometer is graduated in inches. This 

 table enables one to convert inches to millibars. The proper way to 

 use the table is as follows: Find in the table (in one of the columns 

 headed inches) the value which is closest to the corrected barometer 

 reading. In the column just to the right will be found the equiva- 

 lent value in millibars. In the column just to the left will be found 

 the proper code number. This number should be entered on Form 

 1210A under the heading *'PP, Barometer as coded." It will be seen 

 that the code number always consists of the last two figures of the 

 ■•eading as expressed in millibars. Consequently, observers who have 

 barometers with the millibar scale do not need to refer to the code 

 table for PP. In this case the last two figures of the corrected 

 barometer reading to the nearest whole millibar are entered directly 

 in the "Barometer as coded" column on Form 1210A. 



Code tahJe for PP {Corrected boroiucter reading) 

 [In millibars and inches] 



