Instructables

Step 3: Almost Done! But Not Quite!

Picture of Almost Done! But Not Quite!
Now you need to assemble the rest. The coil is the biggest part. Now, take the safety pins and rubber band them together. 

If you don't want to burn yourself (the rubber band won't do anything except for keep the pins from flying) then take the cotton ball and rip it into two parts. Then, stick the pin in a "pocket" that you create by sticking your finger in...sort of like pottery...well I guess it's more like cottonery...

Either way, put the safety pin in like in the third picture. Flatten the cottonery and rest the safety pin on it like in the fourth picture. Next tape it down onto the cotton with a piece of regular household tape like in the fifth and sixth picture. Then, like in the seventh picture, make two of them.

Now for assembly.
 
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Nyxius1 year ago
The safety pins have a higher magnetic permeability than the air. This means that flux lines would rather travel a longer distance through the pins than through air. This is why magnetic shielding works. This greater permeability makes the pins stick to the battery which also has a higher permeability. This creates two horseshoe shaped sets of flux lines. It also helps that the pins and battery are probably ferromagnetic materials which means that they amplify any field passing through them. I could go into more detail if anyone wants me too.
lis.tesla3 years ago
the reason the safety pins are sticking to the battery is because of the magnet on the battery.
It is magnetizing the outer coating of the battery,
which is why the safety pins are sticking to it>
Think outside the box
:)
M0HIZ lis.tesla2 years ago
Shouldn't that be outside the battery?
blinkyblinky (author)  lis.tesla3 years ago
i think rimar2000 stated that already...