The earth is, itself, a giant magnet. It has an iron core, and spins around on an axis from the North Pole to the South Pole. Every magnet has two poles, north and south. A compass needle is a steel magnet that can spin freely. The needle turns freely, and the direction of the needle lines up with the lines of magnetic force pointing towards the earth's own magnetic north pole. The magnetic north pole is very close to the physical north pole. Once a person knows which way North is, we can figure out all the other directions.
A ship is steered on a straight course by means of a magnetic compass. This consists of a freely suspended magnet balanced on a fine point of hard metal, to which is attached a light compass card marked with the points of the compass, and with degrees. The whole is encased in a sealed bowl of non-magnetic metal which is both air-tight and watertight. On the fore edge of the compass bowl a line, the "lubber" line, is marked, representing the ship's head. Thus the course the ship is steering can easily be read, as it is in line with the lubber line on the compass bowl. Remember the compass card remains stationary, it is the lubber line which moves with the ship. The compass does not point to true north, but to magnetic north, one of the poles of the earth's magnetic field. Allowance is made for this variation.
by HubPages 7 years ago
Where is North
by rajkumat 7 years ago
can north pole and south pole of a magent be seperated?
by your cybersister 7 years ago
Does magnetic therapy help certain medical conditions or is it a scam?
by Grace Marguerite Williams 2 years ago
What are the qualities that makes a man sexually appealing, even sexually magnetic?
by Mr. Happy 4 years ago
Canada is claiming the North Pole as Canadian territory.Just curious what others thought of this (if anything)?
by Goody5 5 years ago
Are Santa Claus melons grown at the North Pole?There really is a melon with this name. After seeing this type of melon on a cooking show I was curious if a watermelon was ever grown at the North pole (Maybe on an expedition)?
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