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YOU CAN DO IT
BUILD A COMPASS



 

SUPPLIES YOU NEED


* One clear plastic cup

* One pencil or pen

* One magnet

* Thread

* One needle or small nail

* One cork or piece of foam

With these supplies and the help of an adult, you can have fun building the compasses below.
     
  (1) Rub one end of the magnet along a needle. Always rub in the same direction. Do this about 30 times to magnetize the needle. Test it by picking up a pin.

(2) FLOATING COMPASS. Cut a small piece of cork off and push the magnetized needle through it. Fill the plastic cup with water. Carefully place the cork with magnetized needle into the cup so it is floating in the center.

(3) CHINESE HANGING COMPASS. Tie one end of a short piece of thread to the center of your magnetized needle. Then attach the other end to a pencil and place it over the rim of the plastic cup.
 


Once you've completed your compass, place it on a table and wait for the needle to come to rest. The thickest end of the needle will be pointing north. Now try moving the compass to a new place on the table. The needle will resettle and point north again. Try making both of the compasses above to see which one works best. I find that the needles will lose their magnetism after a while, so you might want to remagnetize them now and then. I hope you have lots of fun. Please e-mail the Professor and let me know how it went.



Your friend,
Professor Alexander