Graham Bell Experiment

I'm  teaching Music Technology classes at the PHL Music Department since september, and today we conducted an experiment in sound that came out quite well. It's great fun for all you nerdy types out there!
Stuff you'll need is : Vinegar , A tuning fork, an iron cup (or other conductive material), Alligator clips, a 9v Battery and headphones. Basically you'll be transmitting the 44O hz of the Tuning fork through electricity, this is how A.G. Bell invented the telephone way back.
Fill the cup with vinegar, then connect one end of the battery to your headphones stripped wire and the other end to the iron cup, also connect the tuning fork to the other stripped wire of the headphones, now whack the fork and dip it slightly with one end in to the vinegar, you'll be able to hear a transmitted signal of your tuning fork tone!
The studens are now off to create their own versions of the notorious APC device!