HOW A COMPASS WORKS Magnetic Needle – Permanently magnetized needle is placed on a pivot and rotates freely in the horizontal plane. Earth’s Magnetic Field.

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Presentation transcript:

HOW A COMPASS WORKS Magnetic Needle – Permanently magnetized needle is placed on a pivot and rotates freely in the horizontal plane. Earth’s Magnetic Field – Exerts forces on the compass needle, causing it to rotate until it comes to rest the the same direction as the magnetic field. Magnetic Pole – The north magnetic pole is located about 1000Km from the geographical north pole. Horizontal Force – Responsible for the direction in which the compass needle is oriented. Shift – The magnetic field allows the magnetic north pole to shift geographic position about 5-10cm per year. 405.07 Red Star OHP-1

The Parts of the Compass Sight Sighting Line Sighting Mirror Magnetic Needle Orienting Arrow Screwdriver Luminous Point Adjustable Wrist Lock Safety Cord 405.07 Red Star OHP-2

Care and Maintenance of the Compass Treat your compass with respect! Avoid extremes of temperature Try not to drop or bang your compass - use the safety cord! 405.07 Red Star OHP-3