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The  Shipboard  Degaussing  System - 14221_66
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The  Shipboard  Degaussing  System,  Continued Degaussing Coils    The  degaussing  coil  is  actually  a  large  diameter  electrical  wire.  As  you might  have  guessed,  when  it  is  energized  it  produces  an  electromagnetic field. The  following  table  gives  a  description  of  each  coil  and  its  effect  on  the ship’s  magnetic  field. Coil A F L Q M Description The  A,  or  athwartship,  coil  is  made  up  of  loops  in vertical  fore-and-aft  planes.  The  function  of  the  A coil  is  to  produce  a  magnetic  field  that  will  counteract the  ship’s  athwartship  permanent  and  induced magnetism. The  F,  or  forecastle,  coil  encircles  the  up  to  the forward  l/3  of  the  ship.  It  is  usually  located  just below  the  forecastle  or  uppermost  deck.  The  function of  the  F  coil  is  to  produce  a  magnetic  field  that  will counteract  the  ship’s  longitudinal  permanent  and induced  magnetism. The  L,  or  longitudinal  coil  is  made  up  of  loops  in vertical  planes  parallel  to  the  ship’s  frames.  The function  of  the  L  coil  is  to  produce  a  magnetic  field that  will  counteract  the  ship’s  longitudinal  permanent and  induced  magnetism. The  Q,  or  quarterdeck,  coil  encirles  the  after  l/3  of  a ship.  It  serves  the  same  purpose  as  the  F  coil. The  M,  or  main,  coil  encircles  the  ship  in  a  horizontal plane,  usually  just  below  the  waterline.  The  function of  the  M  coil  is  to  produce  a  magnetic  field  that  will counteract  the  ship’s  vertical  permanent  and  induced magnetism. Degaussing  and The  deviation  to  the  magnetic  compass  resulting  from  these  currents  is the  Magnetic Compass neutralized  as  much  as  possible  by  a  procedure  called  compensation. The  remaining  deviations  caused  by  the  degaussing  coils  are  observed and  plotted  on  the  left  side  of  the  deviation  table. 2-13

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