Figure 2-18.Psychrometer: (A) Standard sling psychrometer; (B) with sling attached.
detailed instructions, refer to the handbook supplied
with the equipment.
SLING AND ROTOR PSYCHROMETERS
Sling psychrometers (fig. 2-l8) are used to backup
the electric psychrometers, both ashore and aboard ship.
Because of the widespread use of electric
psychrometers, sling psychrometers are rarely used.
Rotor psychrometers (fig. 2-19), mounted inside the
standard instrument shelter ashore, are also rarely used
as backups. Use, care, and maintenance instructions are
found in NA 50-30FR-518.
Q16. Name the three types of psychrometers used by
Q17. Explain the proper use of an electric
Q18. What tasks are included in the routine care of
LEARNING OBJECTIVE: Describe the
operation of the precision aneroid barometer
and the marine barograph.
Pressure-measuring instruments are critical
equipment for surface weather observations. The ML-
448/UM precision aneroid barometer is still the primary
Figure 2-19.Rotor psychrometer.