8. Making A Morse Sounder
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Material: 
Metal strip -- Brass tacks -- 1.5 volt batteries -- Insulated wire & hammer
Method: 
1) When you press the key and make the metal strip touch the brass tack attached to the end of the wire, and magnetize the nail, it will pull the metal strip and make a clicking noise. 
2) Release the key, magnetism is lost as no current passes and the metal strip is released.
Diagram of Experiment 8

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