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Wind, Continued - 14221_316
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Wind, Continued - 14221_318
Wind, Continued Using Hand Held Anemometers If  anemometers  are  not  installed  or  not  working  properly,  or  for  some reason  the  readings  are  in  doubt,  the  hand-held  anemometer  should  be used.  The  Wind  Measuring  Set  AN/PMQ-3  (fig.  10-11)  is  a  hand-held anemometer.  It  is  a  combination  wind  direction  and  speed  indicator.  It indicates  direction  to  360°  and  speed  from  0  to  60  knots.  The  speed indicator  has  two  scales,  graduated  from  0  to  15  knots  and  0  to  60 knots.  To  use  the  hand-held  anemometer,  you  choose  an  observation point  on  the  windward  side  of  the  ship,  as  far  upwind  as  possible.  For example,  if  the  wind  is  from  the  stem,  go  aft;  if  it  is  from  the  bow,  go forward.  If  possible,  stand  facing  parallel  to  the  ship’s  centerline  and into  the  wind. When  you  use  the  hand-held  anemometer,  follow  the  instructions  given in  the  table  below. Step Action 1. Grasp  the  instrument  by  the  handle  and  hold  it  in  an approximately  vertical  position  at  arm’s  length  with  the  sight  at eye level. 2. Aim  the  instrument  at  an  imaginary  point  on  the  horizon.  This is  done  by  aligning  the  center  of  the  slot  in  the  front  of  the sight  with  the  center  of  the  strip  between  the  two  slots  on  the rear  sight.  Aim  it  as  you  would  a  gun. 3. Press  and  hold  the  vane  locking  trigger.  Note  the  reading  on the  0  to  60  (upper)  scale  on  the  wind  speed  indicator.  If  the wind  speed  reading  is  less  than  15  knots,  press  the  range selecting  trigger  on  the  side  of  the  housing,  and  observe  the reading  on  the  0  to  15  scale.  Care  must  be  taken  not  to  take the  first  reading  on  the  0  to  15  scale  because  a  wind  speed  in excess  of  15  knots  may  damage  the  anemometer. 4. Note  the  motion  of  the  wind  vane  as  it  moves  between  the extremes,  and  release  the  vane  locking  trigger  when  the  vane  is in  the  position  of  the  predominant  (average)  wind  direction. Carefully  lower  and  tilt  the  anemometer  and  note  the  wind direction  reading  on  the  direction  dial.  If  the  wind  is  being observed  facing  aft,  the  direction  must  be  converted  in  relation to  the  bow.  Add  180°  for  directions  from  0°  through  90°. Subtract  180°  for  directions  from  270°  through  360°. 5. Maintenance  of  the  AN/PMQ-3  should  be  in  accordance  with PMS  instructions. 10-21

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