. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2—PRESSURE. Figure 2-7.—Precision aneroid barometer (ML-448/UM). mercurial barometer. These differences are logged, and the algebraic mean is computed to determine an acceptable instrument correc- tion. This correction is then posted on or near the instrument and applied to subsequent station pressure readings. Procedures for computing an acceptable precision aneroid barometer cor- rection may be found in the Manual of Barometry or FMH No. 1, chapter A-12. Shipboard aneroid barometers should be fre-
. Aerographer's Mate 3 & 2. United States. Navy; Meteorology; Oceanography. Chapter 2—PRESSURE. Figure 2-7.—Precision aneroid barometer (ML-448/UM). mercurial barometer. These differences are logged, and the algebraic mean is computed to determine an acceptable instrument correc- tion. This correction is then posted on or near the instrument and applied to subsequent station pressure readings. Procedures for computing an acceptable precision aneroid barometer cor- rection may be found in the Manual of Barometry or FMH No. 1, chapter A-12. Shipboard aneroid barometers should be fre- quently checked for accuracy with a mercurial barometer at a Naval Weather Service unit ashore. Pressure should be reduced to sea level when compared barometers are not at the same elevation (to the nearest foot). In the comparison, care should be taken that the com- parative readings are made simultaneously and during a period when the pressure tendency is steady. When adjusting the setting of the aneroid barometer, use a small screwdriver and remove one-half of the apparent error on the first adjustment. Tap the case lightly to permit the linkage and index hand to settle to the new setting. Obtain a current station pressure from a corrected reading of the mercurial barometer and note the amount of remaining error in the aneroid. Again adjust to remove one-half of the remaining error, tap the case, and allow the hand and linkage to settle. Do not attempt to adjust for any error less than mb. A field main- tenance technician may adjust a precision aneroid to a correction of zero. 27. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Naval Education and Training Program Development Center; United States. Bureau of Naval Personnel. Washington : U. S. Dept. of Defense, Navy Dept. , Naval Education and Tra
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