schoolscienceproject.blogspot.in
Dip to the
pole
Magnetise two
steel pins so that their points attract each other strongly. Push them into the
ends of a piece of foam plastic about as thick as a pencil and balance this by
means of a sewing needle over two tumblers (by shifting the pins and pulling
off pieces of plastic), if you allow this compass to swing in a north-south
direction, it will come to rest with the end facing north sloping downwards. The
compass needle comes to rest parallel to the magnetic field lines, which span
the earth from pole to pole. This deviation (dip) from the horizontal is 670 in
London, 720 in New York. 600 in Los Angeles and at the magnetic poles of the
earth 900.
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