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Wind, Continued - 14220_317
Wind, Continued Installed Anemometers An  installed  anemometer  (fig.  10-9)  is  an  instrument  fixed  somewhere aloft,  usually  at  the  masthead.  The  wind  blows  on  a  propeller  attached to  one  end  of  a  wind  vane  that  pivots.  The  whirling  propeller  revolves  a spindle,  communicating  with  a  synchro  repeater  on  a  pilothouse  or  chart house  bulkhead.  Figure  10-10  shows  one  type  of  synchro  repeater. The  upper  dial  of  the  repeater  is  graduated  in  lo-degree  intervals  and shows  the  relative  direction  from  which  the  wind  is  blowing.  In  this illustration  the  direction  is  about  287°.  The  lower  dial  indicates  the relative  wind  speed  (true  wind  speed  when  the  ship  is  stationary).  The wind  speed  dial  in  the  illustration  shows  about  87  knots.  This  reading means  that  the  force  exerted  by  87  knots  of  wind  is  whirling  the anemometer  propeller. When  using  an  installed  anemometer,  always  compare  the  readings observed  with  the  wind  conditions  as  they  appear  outside.  If  two anemometers  are  installed,  make  sure  that  the  windward  anemometer  is used. Figure  10-9.  Installed  anometer. Figure   10-10.   Synchro repeater. 10-20

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