Dip needle compass.

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(D)Electricity and Magnetism - D+30: Magnetic Fields

Dip needle compass. This 'Dip-Needle' apparatus can be used in two different ways: 1) It can be placed horizontally on the table, and the magnetic compass needle will indicate the direction of magnetic north. 2) Once magnetic north is determined, the apparatus is set up vertically and aligned with magnetic north. Now, the dip needle indicates the angle of the magnetic flux coming up through the earth.
UCB Index: 
D+30+2
PIRA Index: 
5H10.15
Demo Diagram: 

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D+30+1 Large compass needle on stand.
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D+30+4 Earth model with internal magnet and pivoting probe magnet.