Figure 2-18.—Psychrometer: (A) Standard sling psychrometer; (B) with sling attached.detailed instructions, refer to the handbook suppliedwith the equipment.SLING AND ROTOR PSYCHROMETERSSling psychrometers (fig. 2-l8) are used to backupthe electric psychrometers, both ashore and aboard ship.Because of the widespread use of electricpsychrometers, sling psychrometers are rarely used.Rotor psychrometers (fig. 2-19), mounted inside thestandard instrument shelter ashore, are also rarely usedas backups. Use, care, and maintenance instructions arefound in NA 50-30FR-518.REVIEW QUESTIONSQ16. Name the three types of psychrometers used bythe Navy?Q17. Explain the proper use of an electricpsychrometer.Q18. What tasks are included in the routine care ofelectric psychrometers?PRESSURE INSTRUMENTSLEARNING OBJECTIVE: Describe theoperation of the precision aneroid barometerand the marine barograph.Pressure-measuring instruments are criticalequipment for surface weather observations. The ML-448/UM precision aneroid barometer is still the primaryFigure 2-19.—Rotor psychrometer.2-13
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