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Temperature, Dew Point, and Relative Humidity, Continued - 14220_324
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Weather  Observation  and  Reporting - 14220_326
Temperature, Dew Point, and Relative Humidity, Continued Electric Psychrometer The  Electric  Psychrometer  ML-450/UM  (fig.  10-13)  is  a  hand-held portable  instrument  that  serves  the  same  purpose  as  the  sling psychrometer.  As  a  Quartermaster  this  will  probably  be  the  only  type  of psychrometer  that  you  use,  since  most  ships  do  not  carry  the  sling psychrometer.  Three  D-size  batteries  furnish  power  to  a  self-contained ventilation  fan  that  aspirates  the  thermometer.  The  instrument  also contains  a  lamp  for  nighttime  readings.  When  using  the  electric psychrometer,  select  a  shady  area  with  no  obstructions  within  3  to  4  feet and  face  into  the  wind.  Hold  the  instrument  at  waist  height  with  the  air intake  pointing  into  the  wind.  Obtain  the  dry-bulb  temperature  first. When  the  ambient  (circulating)  air  temperature  is  50°F,  or  above,  it  is not  necessary  to  energize  the  ventilation  fan.  The  electric  psychrometer should  be  exposed  to  the  ambient  air  for  at  least  5  minutes  before  you read  it.  When  no  further  decrease  of  the  wet-bulb  temperature  is apparent,  read  the  wet-bulb. Finding the Dew Use  the  psychrometer  table  10-2  to  compute  the  dew  point.  The  Manual Point for   Ship's   Surface   Weather   Observations   (NAVOCEANCOMINST 3144.1C)  contains  complete  tables.  Take  a  dry-bulb  temperature  of  70°F and  a  wet-bulb  temperature  of  60.5°F.  The  difference  between  the  two readings,  9.5°F,  is  called  the  wet-bulb  depression. Example:  To  compute  the  dew  point,  you  enter  the  wet-bulb  reading (60.5°F).   Go   to   the   proper   DEPRESSION   column   (9.5°F).   Read   the dew  point  temperature  (54°F)  directly  from  the  intersection  of  the temperature  row  and  the  DEPRESSION  column. Table   10-2.   Psychrometer   Table 10-29

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