. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 INCH SCALE Vernier reading inch ^ MB ^ASCALE — —— 1020. 040 1000 29 Scale reading inches 980 OBSERVED BAROMETER READING INCHES Figure 2-1. —Reading the Mercurial barometer. constant additive correction. This constant ad- ditive correction is a permanent value to be added (algebraically) to the station pressure. Each station authorized to use the constant additive correction has been assigned this value by Naval Weather Service Detachment (NWSD), Asheville, For i
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. AEROGRAPHER'S MATE 3 & 2 INCH SCALE Vernier reading inch ^ MB ^ASCALE — —— 1020. 040 1000 29 Scale reading inches 980 OBSERVED BAROMETER READING INCHES Figure 2-1. —Reading the Mercurial barometer. constant additive correction. This constant ad- ditive correction is a permanent value to be added (algebraically) to the station pressure. Each station authorized to use the constant additive correction has been assigned this value by Naval Weather Service Detachment (NWSD), Asheville, For instance, Naval Station Midway Island would add + to the station pressure in order to obtain sea level pressure. REDUCTION BY COMPUTER.—Shore activ- ities not authorized to use the constant additive correction, use Meteorological Pressure Reduc- tion Computer CP-402/UM, together with the tables of "r" values. The "rM value is a ratio of sea level pressure to station pressure for each degree of temper- ature. As this ratio is always equal to or greater than unity (1), the figure "1" preceding the decimal point has been omitted from the "r" tables. No interpolation is necessary when using the table of "r" values. Complete instructions for the use of the computer are printed on the computer. Instruc- tions for the "r" tables are given with the tables. The "r" table must be appropriate for the station elevation and location. To obtain "r" tables, a request should be sent to the Naval Weather Service Detachment (NWSD) Ashe- ville, North Carolina 28801. Altimeter Setting Altimeter settings are computed for all obser- vations with the exception of a single element special. They are recomputed when necessary to meet local requirements or upon request. Values are determined at stations equipped with a mercurial barometer that is used routinely as a comparison standard. Barometric instruments used to
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Keywords: ., bookcentury1900, booksubjectmeteorology, booksubjectunitedstates
