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 ngureco 6 years ago
Should Children Follow The Religion Of Their Parents, Or Should They Freely Choose Another Religion?
by paarsurrey 7 years ago
Can Holy Mary visit and move about freely in Italy in her dresses she was used to wear as we see her depicted in the Catholic Churches? I think perhaps the new laws when enacted won’t allow her.
by Grace Marguerite Williams 2 years ago
What are the qualities that makes a man sexually appealing, even sexually magnetic?
by cyberstudent99 7 years ago
Should children under 13 should be allowed to use internet freely?
|HubPages Device ID|
|Login||This is necessary to sign in to the HubPages Service.|
|HubPages Google Analytics|
|HubPages Traffic Pixel|
|Google Hosted Libraries|
|Google AdSense Host API|
|Conversion Tracking Pixels|
|Author Google Analytics|
|Amazon Tracking Pixel|