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Chapter  2 Compasses - 14220_55
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Quartermaster 1 & C - Military manual for the Quartermaster rate
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Earth’s  Magnetic  Field - 14220_57
The  Magnetic  Compass Introduction Before  we  proceed  to  determine  the  proper  compass  heading  to  steer, we  must  first  learn  about  the  workings  of  the  magnetic  compass. To  enable  you  to  understand  the  principles,  we  will  explore  the properties  of  magnetism. Magnetism Magnetism  is  a  phenomenon  of  nature  known  only  by  its  effects.  It appears  as  a  physical  force  between  two  objects  of  metal,  at  least  one  of which  has  been  previously  magnetized  and  has  become  a  magnet. Definition A  magnet  is  a  metallic  element  that  has  the  property  for  attracting  iron and  producing  a  magnetic  field  around  itself.  For  the  purpose  of illustration,  this  magnetic  field  is  usually  pictured  as  lines  of  force. Figure  2-1.  Magnetic  lines  of  force. Types  of Magnetism There  are  two  types  of  magnetism:  permanent  and  induced.  A  metal bar  having  permanent  magnetism  will  retain  its  properties  when  it  is removed  from  a  magnetic  field. A  metal  bar  having  induced  magnetism,  however,  will  lose  its  properties when  it  is  removed  from  the  same  field 2-2

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